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<div class="header-banner topBanner" data-type="header" style="display: block; position: sticky; top: 0; z-index: 999;">
<a data-source="219611" data-banner="226288" class="universal-notice js-universal-notice-notice universal-notice--webp universal-notice--bitrix universal-notice--active" href="https://skillbox.ru/sale/main/?utm_source=media&utm_medium=banners&utm_campaign=all_all_media_banners_banners_header_all_all_skillbox" target="_blank" style="--banner-bg: #5927E9;--banner-color: #fff;--button-font-color: #000000;--button-bg-color: #FFFFFF;--banner-img-left: url(https://cdn.skillbox.pro/mainsite/banners/promo_picture_left/602754/f9ac17dd-a1d4-46c6-aa14-4f7b949defd1.png);--banner-img-left-webp: url(https://cdn.skillbox.pro/mainsite/banners/promo_picture_left/602754/f9ac17dd-a1d4-46c6-aa14-4f7b949defd1.webp);--banner-img-center: url(https://cdn.skillbox.pro/mainsite/banners/promo_picture_center/602507/232fc4a5-b130-4af2-a629-bdb293a4dd2e.png);--banner-img-center-webp: url(https://cdn.skillbox.pro/mainsite/banners/promo_picture_center/602507/232fc4a5-b130-4af2-a629-bdb293a4dd2e.webp);--banner-img-center-mobile: url(https://cdn.skillbox.pro/mainsite/banners/promo_picture_center/602507/232fc4a5-b130-4af2-a629-bdb293a4dd2e.png);--banner-img-center-mobile-webp: url(https://cdn.skillbox.pro/mainsite/banners/promo_picture_center/602507/232fc4a5-b130-4af2-a629-bdb293a4dd2e.webp);--banner-img-right: url(https://cdn.skillbox.pro/mainsite/banners/promo_picture_right/602755/ad7a7fe5-b8d3-47a3-885b-51a7971c12a9.png);--banner-img-right-webp: url(https://cdn.skillbox.pro/mainsite/banners/promo_picture_right/602755/ad7a7fe5-b8d3-47a3-885b-51a7971c12a9.webp);">
<span class="universal-notice__wrapper">
<b class="universal-notice__title">
Скидка до 55% и 3 курса в подарок
</b>
<span class="universal-timer js-universal-notice-timer js-universal-notice-active">
<span class="universal-timer__days js-universal-notice-days">2 дня</span>
<span class="js-universal-notice-hours">13</span>
:<span class="js-universal-notice-minutes">30</span>
:<span class="js-universal-notice-seconds">09</span>
</span>
<span class="universal-notice__button">Выбрать курс</span>
</span>
</a><script>
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const deadline = new Date();
deadline.setDate(5);
deadline.setHours(0, 0, 0);
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const elHours = timer.querySelector('.js-universal-notice-hours');
const elMinutes = timer.querySelector('.js-universal-notice-minutes');
const elSeconds = timer.querySelector('.js-universal-notice-seconds');
// Функция обновления таймера
const updateTimer = () => {
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let diff = Math.max(0, deadline - now);
if (diff === 0) {
let lastDayOfMonth = new Date(now.getFullYear(), now.getMonth() + 1, 0);
let lastDay = lastDayOfMonth.getDate();
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deadline.setMonth(deadline.getMonth() + 1, 1);
} else {
deadline.setDate(deadline.getDate() + 4);
}
diff = Math.max(0, deadline - now);
}
// Time calculations for days, hours, minutes and seconds
var days = Math.floor(diff / (1000 * 60 * 60 * 24));
var hours = Math.floor((diff % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60)).toString();
var minutes = Math.floor((diff % (1000 * 60 * 60)) / (1000 * 60)).toString();
var seconds = Math.floor((diff % (1000 * 60)) / 1000).toString();
if (timer) {
let dayTitles = ['день', 'дня', 'дней'];
let daySuffix = dayTitles[(days % 100 > 4 && days % 100 < 20) ? 2 : [2, 0, 1, 1, 1, 2][days % 10 < 5 ? days % 10 : 5]]
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elMinutes.innerHTML = minutes.padStart(2, '0');
elSeconds.innerHTML = seconds.padStart(2, '0');
}
};
updateTimer();
const timerId = setInterval(updateTimer, 1000);
});
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<li class="info-item"> <time class="info-text" datatime="#">26 июн 2024</time></li>
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Иллюстрация: Оля Ежак для Skillbox Media </p>
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Марина Демидова </div>
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Программист, консультант, специалист по документированию. Легко и доступно рассказывает о сложных вещах в программировании и дизайне. </div>
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<div class="stk-post stk-layout_12col_18068 stk-theme_26309" data-stk="{"images":[{"id":84341,"alt":"","caption":""},{"id":84337,"alt":"","caption":""},{"id":84336,"alt":"","caption":""},{"id":84335,"alt":"","caption":""},{"id":84338,"alt":"","caption":""},{"id":84334,"alt":"","caption":""}]}" data-ui-id="post" data-ce-tag="post" data-reset-type="class" data-layout-type="auto" data-editor-version="3.2.8-rc1"><div class="stk-theme_26309__mb_15 stk-grid" data-ce-tag="grid"><div data-col-width="12" class="stk-grid-col stk-grid-col_last" data-ce-tag="grid-col"><p class="stk-reset" data-ce-tag="paragraph">Оконные функции в SQL (от англ. window function) — это особый класс функций, позволяющий производить вычисления по определённым группам строк в базе данных. При этом они не объединяют строки в одну, а возвращают столько же, сколько было на входе.</p><p class="stk-reset" data-ce-tag="paragraph">Эти функции удобно использовать для отчётов, анализа данных, финансового моделирования и других задач, где нужно видеть результаты в контексте исходных данных. С их помощью можно выполнять различные вычисления для набора строк: подсчитывать среднее число, сумму и многие другое.</p><p class="stk-theme_26309__mb_05 stk-reset" data-ce-tag="paragraph">Всё самое важное об оконных функциях в SQL:</p><ul class="stk-theme_26309__pad_hor_1 stk-reset" data-ce-tag="list"><li class="stk-reset stk-list-item" data-ce-tag="list-item"><a class="stk-reset" href="#stk-1">таблица для примеров</a>;</li><li class="stk-reset stk-list-item" data-ce-tag="list-item"><a class="stk-reset" href="#stk-2">синтаксис оконных функций</a>;</li><li class="stk-reset stk-list-item" data-ce-tag="list-item"><a class="stk-reset" href="#stk-3">классы оконных функций</a>.</li></ul><div class="stk-grid" data-stk-css="stkMko7Y" data-ce-tag="grid"><div data-col-width="4" class="stk-grid-col" data-stk-css="" data-stk-css-m="" data-ce-tag="grid-col"><figure class="stk-reset stk-image-figure" data-ce-tag="image-figure"><div class="stk-mask" data-ce-tag="mask"><img class="stk-image stk-reset" data-image-id="84341" src="/upload/setka_images/13362625062024_cc9fc8e6480ae902b98b6d5847371c9f0b916420.jpg" loading="lazy"/></div></figure></div><div data-col-width="8" class="stk-grid-col stk-theme_26309__pad_round_1 stk-grid-col_last" data-ce-tag="grid-col"><p class="stk-theme_26309__style_small_text stk-theme_26309__mb_05 stk-reset" data-ce-tag="paragraph"><strong class="stk-reset">ЭКСПЕРТ</strong></p><h3 class="stk-theme_26309__style_medium_header stk-theme_26309__mb_05 stk-reset" data-ce-tag="paragraph"><strong class="stk-reset">Елена Грачёва</strong></h3><p class="stk-theme_26309__mb_05 stk-reset" data-ce-tag="paragraph">Разработчик-фрилансер. Занимается iOS-разработкой с 2011 года. Вела курс по Swift в Астраханском государственном университете. Программный директор и эксперт по мобильной разработке в Skillbox.</p><p class="stk-theme_26309__mb_05 stk-reset" data-ce-tag="paragraph">С 2016 года также занималась управлением проектами в мобильной разработке.</p></div></div></div></div><div class="stk-theme_26309__mb_15 stk-grid" data-ce-tag="grid"><div data-col-width="12" class="stk-grid-col stk-grid-col_last" data-ce-tag="grid-col"><h2 class="stk-reset stk-theme_26309__style_large_header" data-ce-tag="paragraph" id="stk-1"><strong class="stk-reset">Таблица для примеров</strong></h2><p class="stk-theme_26309__mb_05 stk-reset" data-ce-tag="paragraph">Создадим таблицу <u class="stk-reset">sport_sales</u>, содержащую продажи магазина спортивных товаров по отделам. Включим в неё следующие поля:</p><ul class="stk-theme_26309__pad_hor_1 stk-reset" data-ce-tag="list"><li class="stk-reset stk-list-item" data-ce-tag="list-item"><u class="stk-reset">id</u> — уникальный идентификатор каждой записи;</li><li class="stk-reset stk-list-item" data-ce-tag="list-item"><u class="stk-reset">sale_date</u> — дата продаж по каждому отделу;</li><li class="stk-reset stk-list-item" data-ce-tag="list-item"><u class="stk-reset">department</u> — наименование отдела;</li><li class="stk-reset stk-list-item" data-ce-tag="list-item"><u class="stk-reset">sales</u> — количество продаж по каждому отделу за день.</li></ul><p class="stk-theme_26309__mb_05 stk-reset" data-ce-tag="paragraph">Таблицу можно создать с помощью следующего запроса:</p><figure class="stk-reset stk-embed_rendered" data-ce-tag="embed"><code class="stk-code"><pre class="hljs" style="display: block; overflow-x: auto; padding: 0.5em; background: rgb(0, 0, 0); color: rgb(248, 248, 248);"><span class="hljs-keyword" style="color: rgb(150, 203, 254);">CREATE</span> <span class="hljs-keyword" style="color: rgb(150, 203, 254);">TABLE</span> <span class="hljs-keyword" style="color: rgb(255, 115, 253);">IF</span> <span class="hljs-keyword" style="color: rgb(150, 203, 254);">NOT</span> <span class="hljs-keyword" style="color: rgb(150, 203, 254);">EXISTS</span> sport_sales
(
<span>id</span> <span class="hljs-keyword" style="color: rgb(150, 203, 254);">integer primary key</span>,
<span> sale_date</span> <span class="hljs-keyword" style="color: rgb(150, 203, 254);">date</span>,
<span>department</span> <span class="hljs-keyword" style="color: rgb(150, 203, 254);">varchar</span>(<span class="hljs-number" style="color: rgb(255, 115, 253);">50</span>),
<span>sales</span> <span class="hljs-keyword" style="color: rgb(150, 203, 254);">integer</span>
);</pre></code><figcaption class="stk-reset stk-description" data-ce-tag="description"></figcaption></figure><p class="stk-theme_26309__mb_05 stk-reset" data-ce-tag="paragraph">А для заполнения таблицы данными используем следующий код:</p><figure class="stk-reset stk-embed_rendered" data-ce-tag="embed"><code class="stk-code"><pre class="hljs" style="display: block; overflow-x: auto; padding: 0.5em; background: rgb(0, 0, 0); color: rgb(248, 248, 248);"><span class="hljs-keyword" style="color: rgb(150, 203, 254);">insert</span> <span class="hljs-keyword" style="color: rgb(150, 203, 254);">into</span> sport_sales
(id, sale_date, department, sales)
<span class="hljs-keyword" style="color: rgb(150, 203, 254);">values</span>
(<span class="hljs-number" style="color: rgb(168, 255, 96);">1</span>, <span class="hljs-number" style="color: rgb(255, 115, 253);">2024-02-01</span>, <span class="hljs-string" style="color: rgb(255, 115, 253);">'Shoes'</span>, <span class="hljs-number" style="color: rgb(168, 255, 96);">6</span>),
(<span class="hljs-number" style="color: rgb(168, 255, 96);">2</span>, <span class="hljs-number" style="color: rgb(255, 115, 253);">2024-02-01</span>, <span class="hljs-string" style="color: rgb(255, 115, 253);">Clothing'</span>, <span class="hljs-number" style="color: rgb(168, 255, 96);">5</span>),
(<span class="hljs-number" style="color: rgb(168, 255, 96);">3</span>, <span class="hljs-number" style="color: rgb(255, 115, 253);">2024-02-01</span>, <span class="hljs-string" style="color: rgb(255, 115, 253);">Equipment'</span>, <span class="hljs-number" style="color: rgb(168, 255, 96);">10</span>),
(<span class="hljs-number" style="color: rgb(168, 255, 96);">4</span>, <span class="hljs-number" style="color: rgb(255, 115, 253);">2024-02-02</span>, <span class="hljs-string" style="color: rgb(255, 115, 253);">Clothing'</span>, <span class="hljs-number" style="color: rgb(168, 255, 96);">6</span>),
(<span class="hljs-number" style="color: rgb(168, 255, 96);">5</span>, <span class="hljs-number" style="color: rgb(255, 115, 253);">2024-02-02</span>, <span class="hljs-string" style="color: rgb(255, 115, 253);">Clothing'</span>, <span class="hljs-number" style="color: rgb(168, 255, 96);">6</span>),
(<span class="hljs-number" style="color: rgb(168, 255, 96);">5</span>, <span class="hljs-number" style="color: rgb(255, 115, 253);">2024-02-02</span>, <span class="hljs-string" style="color: rgb(255, 115, 253);">Equipment'</span>, <span class="hljs-number" style="color: rgb(168, 255, 96);">4</span>),
(<span class="hljs-number" style="color: rgb(168, 255, 96);">6</span>, <span class="hljs-number" style="color: rgb(255, 115, 253);">2024-02-01</span>, <span class="hljs-string" style="color: rgb(255, 115, 253);">'Shoes'</span>, <span class="hljs-number" style="color: rgb(168, 255, 96);">4</span>),
(<span class="hljs-number" style="color: rgb(168, 255, 96);">7</span>, <span class="hljs-number" style="color: rgb(255, 115, 253);">2024-02-03</span>, <span class="hljs-string" style="color: rgb(255, 115, 253);">'Shoes'</span>, <span class="hljs-number" style="color: rgb(168, 255, 96);">8</span>),
(<span class="hljs-number" style="color: rgb(168, 255, 96);">8</span>, <span class="hljs-number" style="color: rgb(255, 115, 253);">2024-02-03</span>, <span class="hljs-string" style="color: rgb(255, 115, 253);">Equipment'</span>, <span class="hljs-number" style="color: rgb(168, 255, 96);">10</span>),
(<span class="hljs-number" style="color: rgb(168, 255, 96);">9</span>, <span class="hljs-number" style="color: rgb(255, 115, 253);">2024-02-01</span>, <span class="hljs-string" style="color: rgb(255, 115, 253);">Clothing'</span>, <span class="hljs-number" style="color: rgb(168, 255, 96);">4</span>);</pre></code><figcaption class="stk-reset stk-description" data-ce-tag="description"></figcaption></figure><p class="stk-theme_26309__mb_05 stk-reset" data-ce-tag="paragraph">В результате получим вот такую таблицу базы данных, будем использовать её:</p><div class="stk-table-wrap"><table data-responsive-type="scroll" class="stk-table--bordered_h stk-reset stk-table" data-ce-tag="table"><colgroup><col class="stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stkvYsFl" data-stk-id="37"/><col class="stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stk9I9YF" data-stk-id="38"/><col class="stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stk6lVed" data-stk-id="39"/><col class="stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stk6eiEx" data-stk-id="40"/></colgroup><thead class="stk-reset"><tr class="stk-reset stk-table-row"><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset">id</strong></th><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset">sale_date</strong></th><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset">department</strong></th><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset">sales</strong></th></tr></thead><tbody class="stk-reset"><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-ce-tag="td" data-cell-header="id">1</td><td class="stk-reset stk-table-cell" data-ce-tag="td" data-cell-header="sale_date">2024-02-01</td><td class="stk-reset stk-table-cell" data-ce-tag="td" data-cell-header="department">Shoes</td><td class="stk-reset stk-table-cell" data-ce-tag="td" data-cell-header="sales">6</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-ce-tag="td" data-cell-header="id">2</td><td class="stk-reset stk-table-cell" data-ce-tag="td" data-cell-header="sale_date">2024-02-01</td><td class="stk-reset stk-table-cell" data-ce-tag="td" data-cell-header="department">Clothing</td><td class="stk-reset stk-table-cell" data-ce-tag="td" data-cell-header="sales">5</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-ce-tag="td" data-cell-header="id">3</td><td class="stk-reset stk-table-cell" data-ce-tag="td" data-cell-header="sale_date">2024-02-01</td><td class="stk-reset stk-table-cell" data-ce-tag="td" data-cell-header="department">Equipment</td><td class="stk-reset stk-table-cell" data-ce-tag="td" data-cell-header="sales">10</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-ce-tag="td" data-cell-header="id">4</td><td class="stk-reset stk-table-cell" data-ce-tag="td" data-cell-header="sale_date">2024-02-02</td><td class="stk-reset stk-table-cell" data-ce-tag="td" data-cell-header="department">Clothing</td><td class="stk-reset stk-table-cell" data-ce-tag="td" data-cell-header="sales">6</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-ce-tag="td" data-cell-header="id">5</td><td class="stk-reset stk-table-cell" data-ce-tag="td" data-cell-header="sale_date">2024-02-02</td><td class="stk-reset stk-table-cell" data-ce-tag="td" data-cell-header="department">Equipment</td><td class="stk-reset stk-table-cell" data-ce-tag="td" data-cell-header="sales">4</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-ce-tag="td" data-cell-header="id">6</td><td class="stk-reset stk-table-cell" data-ce-tag="td" data-cell-header="sale_date">2024-02-02</td><td class="stk-reset stk-table-cell" data-ce-tag="td" data-cell-header="department">Shoes</td><td class="stk-reset stk-table-cell" data-ce-tag="td" data-cell-header="sales">4</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-ce-tag="td" data-cell-header="id">7</td><td class="stk-reset stk-table-cell" data-ce-tag="td" data-cell-header="sale_date">2024-02-03</td><td class="stk-reset stk-table-cell" data-ce-tag="td" data-cell-header="department">Shoes</td><td class="stk-reset stk-table-cell" data-ce-tag="td" data-cell-header="sales">8</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-ce-tag="td" data-cell-header="id">8</td><td class="stk-reset stk-table-cell" data-ce-tag="td" data-cell-header="sale_date">2024-02-03</td><td class="stk-reset stk-table-cell" data-ce-tag="td" data-cell-header="department">Equipment</td><td class="stk-reset stk-table-cell" data-ce-tag="td" data-cell-header="sales">10</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-ce-tag="td" data-cell-header="id">9</td><td class="stk-reset stk-table-cell" data-ce-tag="td" data-cell-header="sale_date">2024-02-03</td><td class="stk-reset stk-table-cell" data-ce-tag="td" data-cell-header="department">Clothing</td><td class="stk-reset stk-table-cell" data-ce-tag="td" data-cell-header="sales">4</td></tr></tbody></table></div></div></div><div class="stk-theme_26309__mb_15 stk-grid" data-ce-tag="grid"><div data-col-width="12" class="stk-grid-col stk-grid-col_last" data-ce-tag="grid-col"><h2 class="stk-reset stk-theme_26309__style_large_header" data-ce-tag="paragraph" id="stk-2">Синтаксис оконных функций</h2><div class="stk-grid" data-ce-tag="grid" data-stk-css="stk5R81Z"><div data-col-width="12" class="stk-grid-col stk-grid-col_last" data-ce-tag="grid-col"><p class="stk-theme_26309__mb_05 stk-theme_26309__style_small_text stk-reset" data-ce-tag="paragraph"><strong class="stk-reset">?️ Технические детали</strong></p><p class="stk-reset" data-ce-tag="paragraph">Синтаксис оконных функций может различаться в разных реализациях SQL. Некоторые функции могут называться иначе или их может не быть вовсе. Запросы в этой статье показаны на примере PL\SQL — диалекта, который используется в <a href="https://skillbox.ru/media/code/baza-dannykh-oracle-db-kak-ona-ustroena-i-chem-khorosha/" target="_blank" class="stk-reset">базах данных под управлением Oracle DB</a>.</p></div></div><p class="stk-theme_26309__mb_05 stk-reset" data-ce-tag="paragraph">В общем виде синтаксис оконных функций выглядит так:</p><figure class="stk-reset stk-embed_rendered" data-ce-tag="embed"><code class="stk-code"><pre class="hljs" style="display: block; overflow-x: auto; padding: 0.5em; background: rgb(0, 0, 0); color: rgb(255, 115, 253);"><window_<span class="hljs-function"><span class="hljs-keyword" style="color: rgb(255, 115, 253);">function</span>>(<span class="hljs-params"><span class="hljs-built_in">arguments</span></span>) <span class="hljs-title" style="color: rgb(255, 115, 253);">OVER</span> (<span class="hljs-params">[Partitioning] [Ordering] [Frame]</span>)
</span></pre></code><figcaption class="stk-reset stk-description" data-ce-tag="description"></figcaption></figure><p class="stk-theme_26309__mb_05 stk-reset" data-ce-tag="paragraph">Детально разберём структуру:</p><ul class="stk-theme_26309__pad_hor_1 stk-reset" data-ce-tag="list"><li class="stk-reset stk-list-item" data-ce-tag="list-item"><u class="stk-reset" data-gtm-vis-has-fired10171822_255="1"><window_function_name></u> — имя оконной функции, например <u class="stk-reset" data-gtm-vis-has-fired10171822_255="1">ROW_NUMBER()</u>, <u class="stk-reset" data-gtm-vis-has-fired10171822_255="1">RANK()</u>, <u class="stk-reset" data-gtm-vis-has-fired10171822_255="1">DENSE_RANK()</u> и другие.</li><li class="stk-reset stk-list-item" data-ce-tag="list-item"><u class="stk-reset">(arguments)</u> — аргументы функции, например имя столбца, по которому происходит расчёт.</li><li class="stk-reset stk-list-item" data-ce-tag="list-item"><u class="stk-reset" data-gtm-vis-has-fired10171822_255="1">OVER()</u> — ключевое слово, которое определяет, как оконная функция будет применятся к набору данных.</li><li class="stk-reset stk-list-item" data-ce-tag="list-item"><u class="stk-reset">[Partitioning]</u> — определяет критерий, по которому строки делятся на подгруппы. Это необязательный компонент.</li><li class="stk-reset stk-list-item" data-ce-tag="list-item"><u class="stk-reset" data-gtm-vis-has-fired10171822_255="1">[Ordering]</u> — указывает порядок строк в каждой подгруппе, что важно для таких функций, как <u class="stk-reset" data-gtm-vis-has-fired10171822_255="1">RANK()</u>, <u class="stk-reset" data-gtm-vis-has-fired10171822_255="1">ROW_NUMBER()</u> и других. Этот элемент тоже необязателен.</li><li class="stk-reset stk-list-item" data-ce-tag="list-item"><u class="stk-reset">[Frame]</u> — задаёт «фрейм» строк относительно текущей. Как правило, используется с ключевыми словами <u class="stk-reset">ROWS</u> или <u class="stk-reset">RANGE</u>.</li></ul><p class="stk-reset" data-ce-tag="paragraph">Рассмотрим подробнее эти компоненты.</p><div class="stk-grid__layout_reverse stk-grid valign-middle stk-theme_26309__mb_15" data-stk-css="stkAt6T4" data-ce-tag="grid"><div data-col-width="4" class="stk-grid-col stk-grid-col_last valign-middle" data-ce-tag="grid-col" data-stk-css="" data-stk-css-m=""><figure class="stk-reset stk-image-figure" data-ce-tag="image-figure"><div class="stk-mask" data-ce-tag="mask"><img src="/upload/setka_images/13242125062024_116fabfed9db662d1ca4922820b351a40369b79d.png" data-image-id="84334" data-image-name="rm1.png" class="stk-image stk-reset" width="372" height="200" loading="lazy"/></div></figure></div><div data-col-width="8" class="stk-grid-col valign-middle" data-ce-tag="grid-col"><p class="stk-reset stk-theme_26309__mb_05 stk-theme_26309__style_font_style-1629726727970" data-ce-tag="paragraph">Читайте также:</p><p class="stk-theme_26309__mb_15 stk-reset stk-theme_26309__style_font_style-1629786048064 stk-theme_26309__style_font_style-1629290372003 stk-theme_26309__color_26309_custom_color_1 article_incut" data-ce-tag="paragraph"><a href="https://skillbox.ru/media/code/kakie-bazy-dannykh-sushchestvuyut-i-dlya-chego-ikh-ispolzuyut-sql-nosql-olap/" target="_blank" class="stk-reset">Какие базы данных существуют и для чего их используют: SQL, NoSQL, OLAP</a></p></div></div><h3 class="stk-theme_26309__style_medium_header stk-theme_26309__mb_05 stk-reset" data-ce-tag="paragraph"><strong class="stk-reset">PARTITION BY</strong></h3><p class="stk-reset" data-ce-tag="paragraph">Параметр, который позволяет разделить данные на группы, внутри которых будет применяться оконная функция. <u class="stk-reset">PARTITION BY</u> действует аналогично <u class="stk-reset">GROUP BY</u> в <span class="stk-reset" data-stk-footnote-link="fn_6-oh">агрегатных функциях</span>, но в оконных функциях результат возвращается для каждой строки входных данных.</p><p class="stk-theme_26309__mb_05 stk-reset" data-ce-tag="paragraph">Например, рассмотрим, как работает запрос с группировкой <u class="stk-reset">GROUP BY</u>, считающий суммарные продажи за период по каждому отделу:</p><figure class="stk-reset stk-embed_rendered" data-ce-tag="embed"><code class="stk-code"><pre class="hljs" style="display: block; overflow-x: auto; padding: 0.5em; background: rgb(0, 0, 0); color: rgb(248, 248, 248);"><span class="hljs-keyword" style="color: rgb(150, 203, 254);">SELECT</span>
department,
<span class="hljs-keyword" style="color: rgb(255, 115, 253);">sum</span>(sales) <span class="hljs-keyword" style="color: rgb(150, 203, 254);">AS</span> sum_sales
<span class="hljs-keyword" style="color: rgb(150, 203, 254);">FROM</span> sport_sales
<span class="hljs-keyword" style="color: rgb(150, 203, 254);">GROUP</span> <span class="hljs-keyword" style="color: rgb(150, 203, 254);">BY</span> department
<span class="hljs-keyword" style="color: rgb(150, 203, 254);">ORDER</span> <span class="hljs-keyword" style="color: rgb(150, 203, 254);">BY</span> department;</pre></code><figcaption class="stk-reset stk-description" data-ce-tag="description"></figcaption></figure><p class="stk-theme_26309__mb_05 stk-reset" data-ce-tag="paragraph">В результате получим:</p><div class="stk-table-wrap"><table data-responsive-type="scroll" class="stk-table--bordered_h stk-reset stk-table" data-ce-tag="table"><colgroup><col class="stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stkbAebg" data-stk-id="123"/><col class="stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stkYBF3b" data-stk-id="124"/></colgroup><thead class="stk-reset"><tr class="stk-reset stk-table-row"><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset">department</strong></th><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset">sum_sales</strong></th></tr></thead><tbody class="stk-reset"><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-ce-tag="td" data-cell-header="department">Clothing</td><td class="stk-reset stk-table-cell" data-ce-tag="td" data-cell-header="sum_sales">15</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-ce-tag="td" data-cell-header="department">Equipment</td><td class="stk-reset stk-table-cell" data-ce-tag="td" data-cell-header="sum_sales">24</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-ce-tag="td" data-cell-header="department">Shoes</td><td class="stk-reset stk-table-cell" data-ce-tag="td" data-cell-header="sum_sales">18</td></tr></tbody></table></div><p class="stk-reset" data-ce-tag="paragraph">Этот запрос выводит в столбце <u class="stk-reset">sum_sales</u> сумму продаж по каждому отделу.</p><p class="stk-theme_26309__mb_05 stk-reset" data-ce-tag="paragraph">Теперь используем оконную функцию:</p><figure class="stk-reset stk-embed_rendered" data-ce-tag="embed"><code class="stk-code"><pre class="hljs" style="display: block; overflow-x: auto; padding: 0.5em; background: rgb(0, 0, 0); color: rgb(248, 248, 248);"><span class="hljs-keyword" style="color: rgb(150, 203, 254);">SELECT</span>
<span class="hljs-keyword" style="color: rgb(150, 203, 254);">id</span>, sale_date, department, sales,
<span class="hljs-keyword" style="color: rgb(255, 115, 253);">sum</span>(sale) <span class="hljs-keyword" style="color: rgb(150, 203, 254);">OVER</span>(<span class="hljs-keyword" style="color: rgb(150, 203, 254);">PARTITION</span> <span class="hljs-keyword" style="color: rgb(150, 203, 254);">BY</span> department)
<span class="hljs-keyword" style="color: rgb(150, 203, 254);">AS</span> sum_sales
<span class="hljs-keyword" style="color: rgb(150, 203, 254);">FROM</span> sport_sales4
<span class="hljs-keyword" style="color: rgb(150, 203, 254);">ORDER</span> <span class="hljs-keyword" style="color: rgb(150, 203, 254);">BY</span> department, sale_date;
</pre></code><figcaption class="stk-reset stk-description" data-ce-tag="description"></figcaption></figure><p class="stk-theme_26309__mb_05 stk-reset" data-ce-tag="paragraph">Результат будет таким:</p><div class="stk-table-wrap"><table data-responsive-type="scroll" class="stk-table--bordered_h stk-reset stk-table" data-ce-tag="table"><colgroup><col class="stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stkN_eS0" data-stk-id="143"/><col class="stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stkthH7m" data-stk-id="144"/><col class="stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stkgQOGQ" data-stk-id="145"/><col class="stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stkhih3A" data-stk-id="146"/><col class="stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stkAfX8_" data-stk-id="147"/></colgroup><thead class="stk-reset"><tr class="stk-reset stk-table-row"><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset">id</strong></th><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset">sale_date</strong></th><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset">department</strong></th><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset">sales</strong></th><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset">sum_sales</strong></th></tr></thead><tbody class="stk-reset"><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stk10-hv" data-ce-tag="td" data-cell-header="id">2</td><td class="stk-reset stk-table-cell" data-stk-css="stko_RXG" data-ce-tag="td" data-cell-header="sale_date">2024-02-01</td><td class="stk-reset stk-table-cell" data-stk-css="stkqjrKe" data-ce-tag="td" data-cell-header="department">Clothing</td><td class="stk-reset stk-table-cell" data-stk-css="stkkd1Nz" data-ce-tag="td" data-cell-header="sales">5</td><td class="stk-reset stk-table-cell" data-stk-css="stk7t7ex" data-ce-tag="td" data-cell-header="sum_sales">15</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkH99jl" data-ce-tag="td" data-cell-header="id">4</td><td class="stk-reset stk-table-cell" data-stk-css="stkApMm0" data-ce-tag="td" data-cell-header="sale_date">2024-02-02</td><td class="stk-reset stk-table-cell" data-stk-css="stktFZEn" data-ce-tag="td" data-cell-header="department">Clothing</td><td class="stk-reset stk-table-cell" data-stk-css="stkAh77u" data-ce-tag="td" data-cell-header="sales">6</td><td class="stk-reset stk-table-cell" data-stk-css="stklBRXC" data-ce-tag="td" data-cell-header="sum_sales">15</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkvI3k6" data-ce-tag="td" data-cell-header="id">9</td><td class="stk-reset stk-table-cell" data-stk-css="stkI8wEX" data-ce-tag="td" data-cell-header="sale_date">2024-02-03</td><td class="stk-reset stk-table-cell" data-stk-css="stk5vHDG" data-ce-tag="td" data-cell-header="department">Clothing</td><td class="stk-reset stk-table-cell" data-stk-css="stkT5Ztg" data-ce-tag="td" data-cell-header="sales">4</td><td class="stk-reset stk-table-cell" data-stk-css="stkcyAtw" data-ce-tag="td" data-cell-header="sum_sales">15</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkcekqE" data-ce-tag="td" data-cell-header="id">3</td><td class="stk-reset stk-table-cell" data-stk-css="stkUN5_N" data-ce-tag="td" data-cell-header="sale_date">2024-02-01</td><td class="stk-reset stk-table-cell" data-stk-css="stkqlVCO" data-ce-tag="td" data-cell-header="department">Equipment</td><td class="stk-reset stk-table-cell" data-stk-css="stky5cEy" data-ce-tag="td" data-cell-header="sales">10</td><td class="stk-reset stk-table-cell" data-stk-css="stk1XiC1" data-ce-tag="td" data-cell-header="sum_sales">24</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stk6udpO" data-ce-tag="td" data-cell-header="id">5</td><td class="stk-reset stk-table-cell" data-stk-css="stksAPXi" data-ce-tag="td" data-cell-header="sale_date">2024-02-02</td><td class="stk-reset stk-table-cell" data-stk-css="stkpU_G0" data-ce-tag="td" data-cell-header="department">Equipment</td><td class="stk-reset stk-table-cell" data-stk-css="stkrfMjY" data-ce-tag="td" data-cell-header="sales">4</td><td class="stk-reset stk-table-cell" data-stk-css="stkhnoWL" data-ce-tag="td" data-cell-header="sum_sales">24</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkgFEEy" data-ce-tag="td" data-cell-header="id">8</td><td class="stk-reset stk-table-cell" data-stk-css="stkcvQPE" data-ce-tag="td" data-cell-header="sale_date">2024-02-03</td><td class="stk-reset stk-table-cell" data-stk-css="stkZ6nLj" data-ce-tag="td" data-cell-header="department">Equipment</td><td class="stk-reset stk-table-cell" data-stk-css="stkYLeFT" data-ce-tag="td" data-cell-header="sales">10</td><td class="stk-reset stk-table-cell" data-stk-css="stkglg5s" data-ce-tag="td" data-cell-header="sum_sales">24</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkN5wWu" data-ce-tag="td" data-cell-header="id">1</td><td class="stk-reset stk-table-cell" data-stk-css="stkSZmDL" data-ce-tag="td" data-cell-header="sale_date">2024-02-01</td><td class="stk-reset stk-table-cell" data-stk-css="stkbDqa4" data-ce-tag="td" data-cell-header="department">Shoes</td><td class="stk-reset stk-table-cell" data-stk-css="stkZuch-" data-ce-tag="td" data-cell-header="sales">6</td><td class="stk-reset stk-table-cell" data-stk-css="stkJ33aQ" data-ce-tag="td" data-cell-header="sum_sales">18</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stk0vgZM" data-ce-tag="td" data-cell-header="id">6</td><td class="stk-reset stk-table-cell" data-stk-css="stkrmqrm" data-ce-tag="td" data-cell-header="sale_date">2024-02-02</td><td class="stk-reset stk-table-cell" data-stk-css="stkJb8Wu" data-ce-tag="td" data-cell-header="department">Shoes</td><td class="stk-reset stk-table-cell" data-stk-css="stkS3gU6" data-ce-tag="td" data-cell-header="sales">4</td><td class="stk-reset stk-table-cell" data-stk-css="stkVBgYA" data-ce-tag="td" data-cell-header="sum_sales">18</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkEz6l2" data-ce-tag="td" data-cell-header="id">7</td><td class="stk-reset stk-table-cell" data-stk-css="stkhDe2m" data-ce-tag="td" data-cell-header="sale_date">2024-02-03</td><td class="stk-reset stk-table-cell" data-stk-css="stkjsd4M" data-ce-tag="td" data-cell-header="department">Shoes</td><td class="stk-reset stk-table-cell" data-stk-css="stkTDa2H" data-ce-tag="td" data-cell-header="sales">8</td><td class="stk-reset stk-table-cell" data-stk-css="stkujR8L" data-ce-tag="td" data-cell-header="sum_sales">18</td></tr></tbody></table></div><p class="stk-reset" data-ce-tag="paragraph">Этот запрос выводит продажи каждого отдела в столбце <u class="stk-reset">sales</u> и суммарные продажи в столбце <u class="stk-reset">sum_sales</u>. Все строки из исходной таблицы сохраняются, причём они сгруппированы по отделам.</p><div class="stk-grid__layout_reverse stk-grid valign-middle stk-theme_26309__mb_15" data-stk-css="stkPOsfD" data-ce-tag="grid"><div data-col-width="4" class="stk-grid-col stk-grid-col_last valign-middle" data-ce-tag="grid-col" data-stk-css="" data-stk-css-m=""><figure class="stk-reset stk-image-figure" data-ce-tag="image-figure"><div class="stk-mask" data-ce-tag="mask"><img src="/upload/setka_images/13242125062024_46dcb59ca8a4e3d30a63e20d6c27651d3a86b8cd.png" data-image-id="84338" data-image-name="rm2.png" class="stk-image stk-reset" width="372" height="200" loading="lazy"/></div></figure></div><div data-col-width="8" class="stk-grid-col valign-middle" data-ce-tag="grid-col"><p class="stk-reset stk-theme_26309__mb_05 stk-theme_26309__style_font_style-1629726727970" data-ce-tag="paragraph">Читайте также:</p><p class="stk-theme_26309__mb_15 stk-reset stk-theme_26309__style_font_style-1629786048064 stk-theme_26309__style_font_style-1629290372003 stk-theme_26309__color_26309_custom_color_1 article_incut" data-ce-tag="paragraph"><a href="https://skillbox.ru/media/code/sqlzaprosy-osnovnye-komandy-dlya-upravleniya-bazami-dannykh/" target="_blank" class="stk-reset">SQL-запросы: основные команды для управления базами данных</a></p></div></div><h3 class="stk-theme_26309__style_medium_header stk-theme_26309__mb_05 stk-reset" data-ce-tag="paragraph"><strong class="stk-reset">ORDER BY</strong></h3><p class="stk-reset" data-ce-tag="paragraph">Ключевое слово <u class="stk-reset">ORDER BY</u> определяет, как данные будут упорядочены при применении оконной функции.</p><p class="stk-theme_26309__mb_05 stk-reset" data-ce-tag="paragraph">Для определения порядка строк используются ключевые слова <u class="stk-reset">ASC</u> и <u class="stk-reset">DESC</u>:</p><ul class="stk-theme_26309__pad_hor_1 stk-reset" data-ce-tag="list"><li class="stk-reset stk-list-item" data-ce-tag="list-item"><u class="stk-reset">ASC</u> — сортировка по возрастанию. Это значение по умолчанию. Упорядочивание от наименьшего значения к наибольшему.</li><li class="stk-reset stk-list-item" data-ce-tag="list-item"><u class="stk-reset">DESC</u> — сортировка по убыванию. Упорядочивание от наибольшего значения к наименьшему.</li></ul><p class="stk-reset" data-ce-tag="paragraph"><u class="stk-reset">ORDER BY</u> может включать несколько колонок. Например, <u class="stk-reset">ORDER BY sale_date ASC</u>, <u class="stk-reset">sale DESC</u> сначала упорядочивает данные отделов по датам в порядке возрастания, а затем по продажам в порядке убывания.</p><p class="stk-theme_26309__mb_05 stk-reset" data-ce-tag="paragraph">Составим запрос с использованием функции <u class="stk-reset" data-gtm-vis-has-fired10171822_255="1">RANK()</u>, которая присваивает ранг каждой строке в зависимости от значения в столбце <u class="stk-reset" data-gtm-vis-has-fired10171822_255="1">sale</u>. Отделу с наибольшими продажами за день присваивается ранг 1, с наименьшими — ранг 3. Значения столбца <u class="stk-reset" data-gtm-vis-has-fired10171822_255="1">sale_date</u> сгруппируем по возрастанию, а <u class="stk-reset" data-gtm-vis-has-fired10171822_255="1">sales</u> — по убыванию:</p><figure class="stk-reset stk-embed_rendered" data-ce-tag="embed"><code class="stk-code"><pre class="hljs" style="display: block; overflow-x: auto; padding: 0.5em; background: rgb(0, 0, 0); color: rgb(248, 248, 248);"><span class="hljs-keyword" style="color: rgb(150, 203, 254);">SELECT</span>
id, sale_date, department, sales,
<span class="hljs-keyword" style="color: rgb(255, 115, 253);">RANK</span>() <span class="hljs-keyword" style="color: rgb(150, 203, 254);">OVER</span>(<span class="hljs-keyword" style="color: rgb(150, 203, 254);">PARTITION</span> <span class="hljs-keyword" style="color: rgb(150, 203, 254);">BY</span> sale_date <span class="hljs-keyword" style="color: rgb(150, 203, 254);">ORDER</span> <span class="hljs-keyword" style="color: rgb(150, 203, 254);">BY</span> sale_date <span class="hljs-keyword" style="color: rgb(150, 203, 254);">ASC</span>, sales <span class="hljs-keyword" style="color: rgb(150, 203, 254);">DESC</span>)
<span class="hljs-keyword" style="color: rgb(150, 203, 254);">AS</span> <span class="hljs-keyword" style="color: rgb(150, 203, 254);">rank</span>
<span class="hljs-keyword" style="color: rgb(150, 203, 254);">FROM</span> sport_sales;</pre></code><figcaption class="stk-reset stk-description" data-ce-tag="description"></figcaption></figure><p class="stk-theme_26309__mb_05 stk-reset" data-ce-tag="paragraph">Вот какую таблицу получим в итоге:</p><div class="stk-table-wrap stk-theme_26309__mb_15"><table data-responsive-type="scroll" class="stk-table--bordered_h stk-reset stk-table" data-ce-tag="table"><colgroup><col class="stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stkIOVJF" data-stk-id="227"/><col class="stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stkP6HxJ" data-stk-id="228"/><col class="stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stkcUv_N" data-stk-id="229"/><col class="stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stkvAfST" data-stk-id="230"/><col class="stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stkTfEey" data-stk-id="231"/></colgroup><thead class="stk-reset"><tr class="stk-reset stk-table-row"><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset">id</strong></th><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset">sale_date</strong></th><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset">department</strong></th><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset">sales</strong></th><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset">rank</strong></th></tr></thead><tbody class="stk-reset"><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stk_PUDS" data-ce-tag="td" data-cell-header="id">3</td><td class="stk-reset stk-table-cell" data-stk-css="stkEcCuj" data-ce-tag="td" data-cell-header="sale_date">2024-02-01</td><td class="stk-reset stk-table-cell" data-stk-css="stkYmKQb" data-ce-tag="td" data-cell-header="department">Equipment</td><td class="stk-reset stk-table-cell" data-stk-css="stkqxMDU" data-ce-tag="td" data-cell-header="sales">10</td><td class="stk-reset stk-table-cell" data-stk-css="stk1A7wS" data-ce-tag="td" data-cell-header="rank">1</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkT0Fyo" data-ce-tag="td" data-cell-header="id">1</td><td class="stk-reset stk-table-cell" data-stk-css="stkT1_o1" data-ce-tag="td" data-cell-header="sale_date">2024-02-01</td><td class="stk-reset stk-table-cell" data-stk-css="stkuF3NQ" data-ce-tag="td" data-cell-header="department">Shoes</td><td class="stk-reset stk-table-cell" data-stk-css="stkoqn-R" data-ce-tag="td" data-cell-header="sales">6</td><td class="stk-reset stk-table-cell" data-stk-css="stk1omOz" data-ce-tag="td" data-cell-header="rank">2</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkvUfAo" data-ce-tag="td" data-cell-header="id">2</td><td class="stk-reset stk-table-cell" data-stk-css="stkMOgYm" data-ce-tag="td" data-cell-header="sale_date">2024-02-01</td><td class="stk-reset stk-table-cell" data-stk-css="stke5c6o" data-ce-tag="td" data-cell-header="department">Clothing</td><td class="stk-reset stk-table-cell" data-stk-css="stkq1USv" data-ce-tag="td" data-cell-header="sales">5</td><td class="stk-reset stk-table-cell" data-stk-css="stkAQ3OR" data-ce-tag="td" data-cell-header="rank">3</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkIQCVU" data-ce-tag="td" data-cell-header="id">4</td><td class="stk-reset stk-table-cell" data-stk-css="stk-Lai1" data-ce-tag="td" data-cell-header="sale_date">2024-02-02</td><td class="stk-reset stk-table-cell" data-stk-css="stkEAWfY" data-ce-tag="td" data-cell-header="department">Clothing</td><td class="stk-reset stk-table-cell" data-stk-css="stkoF1mv" data-ce-tag="td" data-cell-header="sales">6</td><td class="stk-reset stk-table-cell" data-stk-css="stkUmmPV" data-ce-tag="td" data-cell-header="rank">1</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stklXd4E" data-ce-tag="td" data-cell-header="id">5</td><td class="stk-reset stk-table-cell" data-stk-css="stkrhbkM" data-ce-tag="td" data-cell-header="sale_date">2024-02-02</td><td class="stk-reset stk-table-cell" data-stk-css="stkMza3E" data-ce-tag="td" data-cell-header="department">Equipment</td><td class="stk-reset stk-table-cell" data-stk-css="stkMNgJs" data-ce-tag="td" data-cell-header="sales">4</td><td class="stk-reset stk-table-cell" data-stk-css="stk7cxF6" data-ce-tag="td" data-cell-header="rank">2</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkiUeoi" data-ce-tag="td" data-cell-header="id">6</td><td class="stk-reset stk-table-cell" data-stk-css="stk79WeF" data-ce-tag="td" data-cell-header="sale_date">2024-02-02</td><td class="stk-reset stk-table-cell" data-stk-css="stktpPA0" data-ce-tag="td" data-cell-header="department">Shoes</td><td class="stk-reset stk-table-cell" data-stk-css="stkMY0l9" data-ce-tag="td" data-cell-header="sales">4</td><td class="stk-reset stk-table-cell" data-stk-css="stk-ZbAU" data-ce-tag="td" data-cell-header="rank">2</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkGjQJy" data-ce-tag="td" data-cell-header="id">8</td><td class="stk-reset stk-table-cell" data-stk-css="stkxlDTG" data-ce-tag="td" data-cell-header="sale_date">2024-02-03</td><td class="stk-reset stk-table-cell" data-stk-css="stkkOdnW" data-ce-tag="td" data-cell-header="department">Equipment</td><td class="stk-reset stk-table-cell" data-stk-css="stkV5hlQ" data-ce-tag="td" data-cell-header="sales">10</td><td class="stk-reset stk-table-cell" data-stk-css="stkyJEfU" data-ce-tag="td" data-cell-header="rank">1</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkK9HEf" data-ce-tag="td" data-cell-header="id">7</td><td class="stk-reset stk-table-cell" data-stk-css="stkYAys8" data-ce-tag="td" data-cell-header="sale_date">2024-02-03</td><td class="stk-reset stk-table-cell" data-stk-css="stkaPshG" data-ce-tag="td" data-cell-header="department">Shoes</td><td class="stk-reset stk-table-cell" data-stk-css="stk9_RzK" data-ce-tag="td" data-cell-header="sales">8</td><td class="stk-reset stk-table-cell" data-stk-css="stkuZIEK" data-ce-tag="td" data-cell-header="rank">2</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkOA-Xc" data-ce-tag="td" data-cell-header="id">9</td><td class="stk-reset stk-table-cell" data-stk-css="stkRcug-" data-ce-tag="td" data-cell-header="sale_date">2024-02-03</td><td class="stk-reset stk-table-cell" data-stk-css="stkNgVYc" data-ce-tag="td" data-cell-header="department">Clothing</td><td class="stk-reset stk-table-cell" data-stk-css="stk3To03" data-ce-tag="td" data-cell-header="sales">4</td><td class="stk-reset stk-table-cell" data-stk-css="stkXx91K" data-ce-tag="td" data-cell-header="rank">3</td></tr></tbody></table></div><h3 class="stk-theme_26309__style_medium_header stk-theme_26309__mb_05 stk-reset" data-ce-tag="paragraph"><strong class="stk-reset">ROWS или RANGE</strong></h3><p class="stk-reset" data-ce-tag="paragraph">Ключевые слова <u class="stk-reset">ROWS</u> и <u class="stk-reset">RANGE</u> определяют, какие строки окна будут учитываться при выполнении расчётов. Они устанавливают «фрейм» окна — набор строк относительно текущей строки, который будет использоваться для вычислений.</p><p class="stk-reset" data-ce-tag="paragraph"><u class="stk-reset">ROWS</u> задаёт границы окна в пределах определённого количества строк до или после текущей строки. Например, <u class="stk-reset">ROWS BETWEEN 1 PRECEDING AND 1 FOLLOWING</u> указывает, что окно включает строку перед текущей, текущую и строку после. На их основании будет вычисляться функция.</p><p class="stk-theme_26309__mb_05 stk-reset" data-ce-tag="paragraph">Напишем запрос, который суммирует продажи в текущей, предыдущей и последующей строках и размещает полученные суммы в столбце <u class="stk-reset">sum_sales</u>:</p><figure class="stk-reset stk-embed_rendered" data-ce-tag="embed"><code class="stk-code"><pre class="hljs" style="display: block; overflow-x: auto; padding: 0.5em; background: rgb(0, 0, 0); color: rgb(248, 248, 248);"><span class="hljs-keyword" style="color: rgb(150, 203, 254);">SELECT</span>
id, sale_date, department, sales,
<span class="hljs-keyword" style="color: rgb(255, 115, 253);">SUM</span>(sale) <span class="hljs-keyword" style="color: rgb(150, 203, 254);">OVER</span> (<span class="hljs-keyword" style="color: rgb(150, 203, 254);">ROWS</span> <span class="hljs-keyword" style="color: rgb(150, 203, 254);">BETWEEN</span> <span class="hljs-number" style="color: rgb(255, 115, 253);">1</span> <span class="hljs-keyword" style="color: rgb(150, 203, 254);">PRECEDING</span> <span class="hljs-keyword" style="color: rgb(150, 203, 254);">AND</span> <span class="hljs-number" style="color: rgb(255, 115, 253);">1</span> <span class="hljs-keyword" style="color: rgb(150, 203, 254);">FOLLOWING</span>)
<span class="hljs-keyword" style="color: rgb(150, 203, 254);">AS</span> sum_sales
<span class="hljs-keyword" style="color: rgb(150, 203, 254);">FROM</span> sport_sales;</pre></code><figcaption class="stk-reset stk-description" data-ce-tag="description"></figcaption></figure><p class="stk-theme_26309__mb_05 stk-reset" data-ce-tag="paragraph">В результате получим:</p><div class="stk-table-wrap"><table data-responsive-type="scroll" class="stk-table--bordered_h stk-reset stk-table" data-ce-tag="table"><colgroup><col class="stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stkT4E4L" data-stk-id="300"/><col class="stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stkWrktw" data-stk-id="301"/><col class="stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stkufE0E" data-stk-id="302"/><col class="stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stkL-HVg" data-stk-id="303"/><col class="stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stkTmTcE" data-stk-id="304"/></colgroup><thead class="stk-reset"><tr class="stk-reset stk-table-row"><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset">id</strong></th><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset">sale_date</strong></th><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset">department</strong></th><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset">sales</strong></th><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset">sum_sales</strong></th></tr></thead><tbody class="stk-reset"><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stk4LZhZ" data-ce-tag="td" data-cell-header="id">1</td><td class="stk-reset stk-table-cell" data-stk-css="stkJgYeN" data-ce-tag="td" data-cell-header="sale_date">2024-02-01</td><td class="stk-reset stk-table-cell" data-stk-css="stkkrtc3" data-ce-tag="td" data-cell-header="department">Shoes</td><td class="stk-reset stk-table-cell" data-stk-css="stk1MgVW" data-ce-tag="td" data-cell-header="sales">6</td><td class="stk-reset stk-table-cell" data-stk-css="stkGpp4C" data-ce-tag="td" data-cell-header="sum_sales">11</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkUlp3h" data-ce-tag="td" data-cell-header="id">2</td><td class="stk-reset stk-table-cell" data-stk-css="stkB8j8c" data-ce-tag="td" data-cell-header="sale_date">2024-02-01</td><td class="stk-reset stk-table-cell" data-stk-css="stkCva2N" data-ce-tag="td" data-cell-header="department">Clothing</td><td class="stk-reset stk-table-cell" data-stk-css="stksQhs_" data-ce-tag="td" data-cell-header="sales">5</td><td class="stk-reset stk-table-cell" data-stk-css="stkd2t7T" data-ce-tag="td" data-cell-header="sum_sales">21</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkIS8pz" data-ce-tag="td" data-cell-header="id">3</td><td class="stk-reset stk-table-cell" data-stk-css="stkTO7Hn" data-ce-tag="td" data-cell-header="sale_date">2024-02-01</td><td class="stk-reset stk-table-cell" data-stk-css="stkV4oXc" data-ce-tag="td" data-cell-header="department">Equipment</td><td class="stk-reset stk-table-cell" data-stk-css="stkYzjNX" data-ce-tag="td" data-cell-header="sales">10</td><td class="stk-reset stk-table-cell" data-stk-css="stkNR5mF" data-ce-tag="td" data-cell-header="sum_sales">21</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stknsbke" data-ce-tag="td" data-cell-header="id">4</td><td class="stk-reset stk-table-cell" data-stk-css="stkD3UHO" data-ce-tag="td" data-cell-header="sale_date">2024-02-02</td><td class="stk-reset stk-table-cell" data-stk-css="stk98EBr" data-ce-tag="td" data-cell-header="department">Clothing</td><td class="stk-reset stk-table-cell" data-stk-css="stk7orrx" data-ce-tag="td" data-cell-header="sales">6</td><td class="stk-reset stk-table-cell" data-stk-css="stk9hAn2" data-ce-tag="td" data-cell-header="sum_sales">20</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkmognq" data-ce-tag="td" data-cell-header="id">5</td><td class="stk-reset stk-table-cell" data-stk-css="stk0f0Pf" data-ce-tag="td" data-cell-header="sale_date">2024-02-02</td><td class="stk-reset stk-table-cell" data-stk-css="stkaEWPy" data-ce-tag="td" data-cell-header="department">Equipment</td><td class="stk-reset stk-table-cell" data-stk-css="stkGVB-6" data-ce-tag="td" data-cell-header="sales">4</td><td class="stk-reset stk-table-cell" data-stk-css="stkEU0Wk" data-ce-tag="td" data-cell-header="sum_sales">14</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkd6mVq" data-ce-tag="td" data-cell-header="id">6</td><td class="stk-reset stk-table-cell" data-stk-css="stkRbeHI" data-ce-tag="td" data-cell-header="sale_date">2024-02-02</td><td class="stk-reset stk-table-cell" data-stk-css="stk97nQv" data-ce-tag="td" data-cell-header="department">Shoes</td><td class="stk-reset stk-table-cell" data-stk-css="stklXefT" data-ce-tag="td" data-cell-header="sales">4</td><td class="stk-reset stk-table-cell" data-stk-css="stkn-yj8" data-ce-tag="td" data-cell-header="sum_sales">16</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkohhqv" data-ce-tag="td" data-cell-header="id">7</td><td class="stk-reset stk-table-cell" data-stk-css="stkyoJ9q" data-ce-tag="td" data-cell-header="sale_date">2024-02-03</td><td class="stk-reset stk-table-cell" data-stk-css="stkgncbA" data-ce-tag="td" data-cell-header="department">Shoes</td><td class="stk-reset stk-table-cell" data-stk-css="stkB5Ika" data-ce-tag="td" data-cell-header="sales">8</td><td class="stk-reset stk-table-cell" data-stk-css="stkGmP8a" data-ce-tag="td" data-cell-header="sum_sales">22</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkrQrv4" data-ce-tag="td" data-cell-header="id">8</td><td class="stk-reset stk-table-cell" data-stk-css="stkX9RXK" data-ce-tag="td" data-cell-header="sale_date">2024-02-03</td><td class="stk-reset stk-table-cell" data-stk-css="stkwswdn" data-ce-tag="td" data-cell-header="department">Equipment</td><td class="stk-reset stk-table-cell" data-stk-css="stkN9OMC" data-ce-tag="td" data-cell-header="sales">10</td><td class="stk-reset stk-table-cell" data-stk-css="stk6YJDV" data-ce-tag="td" data-cell-header="sum_sales">22</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkl9c-H" data-ce-tag="td" data-cell-header="id">9</td><td class="stk-reset stk-table-cell" data-stk-css="stkqie0g" data-ce-tag="td" data-cell-header="sale_date">2024-02-03</td><td class="stk-reset stk-table-cell" data-stk-css="stkmm5hJ" data-ce-tag="td" data-cell-header="department">Clothing</td><td class="stk-reset stk-table-cell" data-stk-css="stkqLHfP" data-ce-tag="td" data-cell-header="sales">4</td><td class="stk-reset stk-table-cell" data-stk-css="stkT-xiJ" data-ce-tag="td" data-cell-header="sum_sales">14</td></tr></tbody></table></div><p class="stk-theme_26309__mb_05 stk-reset" data-ce-tag="paragraph">В таблице выше данные сгруппированы по датам, и в столбце <u class="stk-reset">sum_sales</u> считаются так:</p><ul class="stk-theme_26309__pad_hor_1 stk-reset" data-ce-tag="list"><li class="stk-reset stk-list-item" data-ce-tag="list-item">Когда текущая — первая строка, суммируются продажи из первой и второй строки.</li><li class="stk-reset stk-list-item" data-ce-tag="list-item">Когда текущая — вторая строка, суммируются продажи из первой, второй и третьей строки и так далее.</li></ul><p class="stk-reset" data-ce-tag="paragraph"><u class="stk-reset">RANGE</u> устанавливает границы окна на основе значений заданного столбца, а не на физическом расположении строк, как это делает <u class="stk-reset">ROWS</u>. Он группирует вместе строки с одинаковыми или близкими значениями в указанном столбце сортировки.</p><p class="stk-reset" data-ce-tag="paragraph">То есть, когда вы используете <u class="stk-reset">RANGE</u> вместе с <u class="stk-reset">ORDER BY</u>, SQL обрабатывает окно для каждой строки, включая в него всё с соответствующими или сопоставимыми значениями столбца, указанного в <u class="stk-reset">ORDER BY</u>. Это значит, что, если есть несколько строк с одинаковыми значениями в сортируемом столбце (например, одинаковые даты или отделы), они все будут включены в окно.</p><div class="stk-grid__layout_reverse stk-grid valign-middle" data-stk-css="stk0dz9C" data-ce-tag="grid"><div data-col-width="4" class="stk-grid-col stk-grid-col_last valign-middle" data-ce-tag="grid-col" data-stk-css="" data-stk-css-m=""><figure class="stk-reset stk-image-figure" data-ce-tag="image-figure"><div class="stk-mask" data-ce-tag="mask"><img src="/upload/setka_images/13242125062024_5fbb87e295c9b9f9aabf8f06ece94f32fd15c2bd.png" data-image-id="84335" data-image-name="rm3.png" class="stk-image stk-reset" width="372" height="200" loading="lazy"/></div></figure></div><div data-col-width="8" class="stk-grid-col valign-middle" data-ce-tag="grid-col"><p class="stk-reset stk-theme_26309__mb_05 stk-theme_26309__style_font_style-1629726727970" data-ce-tag="paragraph">Читайте также:</p><p class="stk-theme_26309__mb_15 stk-reset stk-theme_26309__style_font_style-1629786048064 stk-theme_26309__style_font_style-1629290372003 stk-theme_26309__color_26309_custom_color_1 article_incut" data-ce-tag="paragraph"><a href="https://skillbox.ru/media/code/chto-takoe-sql-kak-ustroen-zachem-nuzhen-i-kak-s-nim-rabotat/" target="_blank" class="stk-reset">Что такое SQL: как устроен, зачем нужен и как с ним работать</a></p></div></div><p class="stk-theme_26309__mb_05 stk-reset" data-ce-tag="paragraph">Например, рассчитаем кумулятивную (накапливающуюся) сумму продаж по датам. Для этого напишем следующий запрос:</p><figure class="stk-reset stk-embed_rendered" data-ce-tag="embed"><code class="stk-code"><pre class="hljs" style="display: block; overflow-x: auto; padding: 0.5em; background: rgb(0, 0, 0); color: rgb(248, 248, 248);"><span class="hljs-keyword" style="color: rgb(150, 203, 254);">SELECT</span>
id, sale_date, department, sales,
<span class="hljs-keyword" style="color: rgb(255, 115, 253);">SUM</span>(sale) <span class="hljs-keyword" style="color: rgb(150, 203, 254);">OVER</span> (
<span class="hljs-keyword" style="color: rgb(150, 203, 254);">ORDER</span> <span class="hljs-keyword" style="color: rgb(150, 203, 254);">BY</span> sale_date
<span class="hljs-keyword" style="color: rgb(150, 203, 254);">RANGE</span> <span class="hljs-keyword" style="color: rgb(150, 203, 254);">BETWEEN</span> <span class="hljs-keyword" style="color: rgb(150, 203, 254);">UNBOUNDED</span> <span class="hljs-keyword" style="color: rgb(150, 203, 254);">PRECEDING</span> <span class="hljs-keyword" style="color: rgb(150, 203, 254);">AND</span> CURRENT <span class="hljs-keyword" style="color: rgb(150, 203, 254);">ROW</span>
) <span class="hljs-keyword" style="color: rgb(150, 203, 254);">AS</span> cumulative_sales
<span class="hljs-keyword" style="color: rgb(150, 203, 254);">FROM</span> sport_sales;</pre></code><figcaption class="stk-reset stk-description" data-ce-tag="description"></figcaption></figure><p class="stk-reset" data-ce-tag="paragraph">В этом примере для каждой даты будут суммироваться все значения <u class="stk-reset">sale</u> начиная от самой первой записи до текущей даты, включая все строки с датами, равными дате текущей.</p><p class="stk-theme_26309__mb_05 stk-reset" data-ce-tag="paragraph">В результате получим:</p><div class="stk-table-wrap"><table data-responsive-type="scroll" class="stk-table--bordered_h stk-reset stk-table" data-ce-tag="table"><colgroup><col class="stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stk56MKd" data-stk-id="383"/><col class="stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stkkUVC3" data-stk-id="384"/><col class="stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stkUKww4" data-stk-id="385"/><col class="stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stkgfO0b" data-stk-id="386"/><col class="stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stknNkSi" data-stk-id="387"/></colgroup><thead class="stk-reset"><tr class="stk-reset stk-table-row"><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset">id</strong></th><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset">sale_date</strong></th><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset">department</strong></th><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset">sales</strong></th><th class="stk-reset stk-table-cell" data-ce-tag="th">cumulative_sales</th></tr></thead><tbody class="stk-reset"><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkmhg00" data-ce-tag="td" data-cell-header="id">1</td><td class="stk-reset stk-table-cell" data-stk-css="stk2oMw9" data-ce-tag="td" data-cell-header="sale_date">2024-02-01</td><td class="stk-reset stk-table-cell" data-stk-css="stkwRt8B" data-ce-tag="td" data-cell-header="department">Shoes</td><td class="stk-reset stk-table-cell" data-stk-css="stkKC4JE" data-ce-tag="td" data-cell-header="sales">6</td><td class="stk-reset stk-table-cell" data-stk-css="stk7xrfl" data-ce-tag="td" data-cell-header="cumulative_sales">21</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkcmlly" data-ce-tag="td" data-cell-header="id">2</td><td class="stk-reset stk-table-cell" data-stk-css="stk-rOre" data-ce-tag="td" data-cell-header="sale_date">2024-02-01</td><td class="stk-reset stk-table-cell" data-stk-css="stkj-PM6" data-ce-tag="td" data-cell-header="department">Clothing</td><td class="stk-reset stk-table-cell" data-stk-css="stkU9rtK" data-ce-tag="td" data-cell-header="sales">5</td><td class="stk-reset stk-table-cell" data-stk-css="stkrwUqQ" data-ce-tag="td" data-cell-header="cumulative_sales">21</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkpS0Xo" data-ce-tag="td" data-cell-header="id">3</td><td class="stk-reset stk-table-cell" data-stk-css="stk5e2uE" data-ce-tag="td" data-cell-header="sale_date">2024-02-01</td><td class="stk-reset stk-table-cell" data-stk-css="stkfVPJe" data-ce-tag="td" data-cell-header="department">Equipment</td><td class="stk-reset stk-table-cell" data-stk-css="stkPHm9v" data-ce-tag="td" data-cell-header="sales">10</td><td class="stk-reset stk-table-cell" data-stk-css="stk78T2G" data-ce-tag="td" data-cell-header="cumulative_sales">21</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkUBRHX" data-ce-tag="td" data-cell-header="id">4</td><td class="stk-reset stk-table-cell" data-stk-css="stktXXXQ" data-ce-tag="td" data-cell-header="sale_date">2024-02-02</td><td class="stk-reset stk-table-cell" data-stk-css="stkJwclJ" data-ce-tag="td" data-cell-header="department">Clothing</td><td class="stk-reset stk-table-cell" data-stk-css="stkRxW-a" data-ce-tag="td" data-cell-header="sales">6</td><td class="stk-reset stk-table-cell" data-stk-css="stkiDrMC" data-ce-tag="td" data-cell-header="cumulative_sales">35</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stk4qkqY" data-ce-tag="td" data-cell-header="id">5</td><td class="stk-reset stk-table-cell" data-stk-css="stkOWo1J" data-ce-tag="td" data-cell-header="sale_date">2024-02-02</td><td class="stk-reset stk-table-cell" data-stk-css="stkKUjzS" data-ce-tag="td" data-cell-header="department">Equipment</td><td class="stk-reset stk-table-cell" data-stk-css="stkHpPhp" data-ce-tag="td" data-cell-header="sales">4</td><td class="stk-reset stk-table-cell" data-stk-css="stkZiOdw" data-ce-tag="td" data-cell-header="cumulative_sales">35</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkdRB4N" data-ce-tag="td" data-cell-header="id">6</td><td class="stk-reset stk-table-cell" data-stk-css="stkwwN_Q" data-ce-tag="td" data-cell-header="sale_date">2024-02-02</td><td class="stk-reset stk-table-cell" data-stk-css="stkkwO0V" data-ce-tag="td" data-cell-header="department">Shoes</td><td class="stk-reset stk-table-cell" data-stk-css="stkpupef" data-ce-tag="td" data-cell-header="sales">4</td><td class="stk-reset stk-table-cell" data-stk-css="stk8-AOq" data-ce-tag="td" data-cell-header="cumulative_sales">35</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkjinEY" data-ce-tag="td" data-cell-header="id">7</td><td class="stk-reset stk-table-cell" data-stk-css="stk-H88E" data-ce-tag="td" data-cell-header="sale_date">2024-02-03</td><td class="stk-reset stk-table-cell" data-stk-css="stkAhIEo" data-ce-tag="td" data-cell-header="department">Shoes</td><td class="stk-reset stk-table-cell" data-stk-css="stkJYcCJ" data-ce-tag="td" data-cell-header="sales">8</td><td class="stk-reset stk-table-cell" data-stk-css="stks4iJ_" data-ce-tag="td" data-cell-header="cumulative_sales">57</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkVqfmN" data-ce-tag="td" data-cell-header="id">8</td><td class="stk-reset stk-table-cell" data-stk-css="stkMTiXT" data-ce-tag="td" data-cell-header="sale_date">2024-02-03</td><td class="stk-reset stk-table-cell" data-stk-css="stk8aEiv" data-ce-tag="td" data-cell-header="department">Equipment</td><td class="stk-reset stk-table-cell" data-stk-css="stko8jSc" data-ce-tag="td" data-cell-header="sales">10</td><td class="stk-reset stk-table-cell" data-stk-css="stkg3kq5" data-ce-tag="td" data-cell-header="cumulative_sales">57</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stk_XtVM" data-ce-tag="td" data-cell-header="id">9</td><td class="stk-reset stk-table-cell" data-stk-css="stk4_ZA7" data-ce-tag="td" data-cell-header="sale_date">2024-02-03</td><td class="stk-reset stk-table-cell" data-stk-css="stkc_Qzc" data-ce-tag="td" data-cell-header="department">Clothing</td><td class="stk-reset stk-table-cell" data-stk-css="stkhTqhF" data-ce-tag="td" data-cell-header="sales">4</td><td class="stk-reset stk-table-cell" data-stk-css="stkdUDDt" data-ce-tag="td" data-cell-header="cumulative_sales">57</td></tr></tbody></table></div><p class="stk-reset" data-ce-tag="paragraph"><u class="stk-reset">RANGE</u> может быть полезен, когда нужно производить вычисления на группах данных, которые логически связаны (например, записи с теми же датами или близкими ценами).</p></div></div><div class="stk-theme_26309__mb_15 stk-grid" data-ce-tag="grid"><div data-col-width="12" class="stk-grid-col stk-grid-col_last" data-ce-tag="grid-col"><h2 class="stk-reset stk-theme_26309__style_large_header" data-ce-tag="paragraph" id="stk-3"><strong class="stk-reset">Классы оконных функций</strong></h2><p class="stk-theme_26309__mb_0 stk-reset" data-ce-tag="paragraph">В SQL есть множество оконных функций, которые упрощают работу с данными. С их помощью можно быстро проводить сложные вычисления по группам строк, связанных с текущей. Основные оконные функции можно разделить на три большие группы.</p><hr class="stk-theme_26309__separator_divider-1498128612642 stk-theme_26309__mb_05 stk-reset"/><h3 class="stk-theme_26309__style_medium_header stk-theme_26309__mb_05 stk-reset" data-ce-tag="paragraph"><strong class="stk-reset">Агрегатные функции</strong></h3><p class="stk-theme_26309__mb_05 stk-reset" data-ce-tag="paragraph">Агрегатные функции — позволяют выполнять суммирование, подсчёт, нахождение максимумов и минимумов и средних значений. Они производят вычисления над набором строк в окне и возвращают одно результирующее значение:</p><ul class="stk-theme_26309__pad_hor_1 stk-reset" data-ce-tag="list"><li class="stk-reset stk-list-item" data-ce-tag="list-item"><u class="stk-reset" data-gtm-vis-has-fired10171822_255="1">SUM(column_name)</u> — возвращает сумму выбранных значений;</li><li class="stk-reset stk-list-item" data-ce-tag="list-item"><u class="stk-reset" data-gtm-vis-has-fired10171822_255="1">AVG(column_name)</u> — вычисляет среднее значение;</li><li class="stk-reset stk-list-item" data-ce-tag="list-item"><u class="stk-reset" data-gtm-vis-has-fired10171822_255="1">MAX(column_name)</u> и <u class="stk-reset" data-gtm-vis-has-fired10171822_255="1">MIN(column_name)</u> — возвращают максимальное и минимальное значение соответственно;</li><li class="stk-reset stk-list-item" data-ce-tag="list-item"><u class="stk-reset" data-gtm-vis-has-fired10171822_255="1">COUNT(column_name)</u> — находит количество значений.</li></ul><p class="stk-theme_26309__mb_05 stk-reset" data-ce-tag="paragraph">В качестве примера применим агрегатные функции к продажам в отделах для каждой даты так, чтобы каждая строка в окне сохранила исходные значения:</p><figure class="stk-reset stk-embed_rendered" data-ce-tag="embed"><code class="stk-code"><pre class="hljs" style="display: block; overflow-x: auto; padding: 0.5em; background: rgb(0, 0, 0); color: rgb(248, 248, 248);"><span class="hljs-keyword" style="color: rgb(150, 203, 254);">SELECT</span>
id, sale_date, department, sales,
<span class="hljs-keyword" style="color: rgb(255, 115, 253);">AVG</span>(sales) <span class="hljs-keyword" style="color: rgb(150, 203, 254);">OVER</span> (<span class="hljs-keyword" style="color: rgb(150, 203, 254);">PARTITION</span> <span class="hljs-keyword" style="color: rgb(150, 203, 254);">BY</span> sale_date) <span class="hljs-keyword" style="color: rgb(150, 203, 254);">as</span> avg_s,
<span class="hljs-keyword" style="color: rgb(255, 115, 253);">SUM</span>(sales) <span class="hljs-keyword" style="color: rgb(150, 203, 254);">OVER</span> (<span class="hljs-keyword" style="color: rgb(150, 203, 254);">PARTITION</span> <span class="hljs-keyword" style="color: rgb(150, 203, 254);">BY</span> sale_date) <span class="hljs-keyword" style="color: rgb(150, 203, 254);">as</span> sum_s,
<span class="hljs-keyword" style="color: rgb(255, 115, 253);">MAX</span>(sales)<span class="hljs-keyword" style="color: rgb(150, 203, 254);">OVER</span> (<span class="hljs-keyword" style="color: rgb(150, 203, 254);">PARTITION</span> <span class="hljs-keyword" style="color: rgb(150, 203, 254);">BY</span> sale_date) <span class="hljs-keyword" style="color: rgb(150, 203, 254);">as</span> max_s,
<span class="hljs-keyword" style="color: rgb(255, 115, 253);">MIN</span>(sales)<span class="hljs-keyword" style="color: rgb(150, 203, 254);">OVER</span> (<span class="hljs-keyword" style="color: rgb(150, 203, 254);">PARTITION</span> <span class="hljs-keyword" style="color: rgb(150, 203, 254);">BY</span> sale_date) <span class="hljs-keyword" style="color: rgb(150, 203, 254);">as</span> min_s,
<span class="hljs-keyword" style="color: rgb(255, 115, 253);">COUNT</span>(sales) <span class="hljs-keyword" style="color: rgb(150, 203, 254);">OVER</span> (<span class="hljs-keyword" style="color: rgb(150, 203, 254);">PARTITION</span> <span class="hljs-keyword" style="color: rgb(150, 203, 254);">BY</span> sale_date) <span class="hljs-keyword" style="color: rgb(150, 203, 254);">as</span> count_s
<span class="hljs-keyword" style="color: rgb(150, 203, 254);">FROM</span> sport_sales;
</pre></code><figcaption class="stk-reset stk-description" data-ce-tag="description"></figcaption></figure><p class="stk-theme_26309__mb_05 stk-reset" data-ce-tag="paragraph">В результате получим следующую таблицу:</p><div class="stk-table-wrap"><table data-responsive-type="scroll" class="stk-table--bordered_h stk-reset stk-table" data-ce-tag="table"><colgroup><col class="stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stkQsVXN" data-stk-id="466"/><col class="stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stkYNkS_" data-stk-id="467"/><col class="stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stk4BfMX" data-stk-id="468"/><col class="stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stklWjt8" data-stk-id="469"/><col class="stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stkQ6BJm" data-stk-id="470"/><col class="stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stkn61Sq" data-stk-id="471"/><col class="stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stkQlgC9" data-stk-id="472"/><col class="stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stkK6Jia" data-stk-id="473"/><col class="stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stkZMicl" data-stk-id="474"/></colgroup><thead class="stk-reset"><tr class="stk-reset stk-table-row"><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset">id</strong></th><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset">sale_</strong><br><strong class="stk-reset">date</strong></th><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset">department</strong></th><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset">sale</strong></th><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset">avg_s</strong></th><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset">sum_s</strong></th><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset">max_s</strong></th><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset">min_s</strong></th><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset">count_s</strong></th></tr></thead><tbody class="stk-reset"><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkjjVZ8" data-ce-tag="td" data-cell-header="id">1</td><td class="stk-reset stk-table-cell" data-stk-css="stk8CwXs" data-ce-tag="td" data-cell-header="sale_date">2024-02-01</td><td class="stk-reset stk-table-cell" data-stk-css="stknyQSQ" data-ce-tag="td" data-cell-header="department">Shoes</td><td class="stk-reset stk-table-cell" data-stk-css="stk1MuD5" data-ce-tag="td" data-cell-header="sale">6</td><td class="stk-reset stk-table-cell" data-stk-css="stkrM3iP" data-ce-tag="td" data-cell-header="avg_s">7.0</td><td class="stk-reset stk-table-cell" data-stk-css="stkFl6A5" data-ce-tag="td" data-cell-header="sum_s">21</td><td class="stk-reset stk-table-cell" data-stk-css="stkYOMSK" data-ce-tag="td" data-cell-header="max_s">10</td><td class="stk-reset stk-table-cell" data-stk-css="stknylaR" data-ce-tag="td" data-cell-header="min_s">5</td><td class="stk-reset stk-table-cell" data-stk-css="stkuEQN1" data-ce-tag="td" data-cell-header="count_s">3</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkPXPeE" data-ce-tag="td" data-cell-header="id">2</td><td class="stk-reset stk-table-cell" data-stk-css="stkYpcIh" data-ce-tag="td" data-cell-header="sale_date">2024-02-01</td><td class="stk-reset stk-table-cell" data-stk-css="stklKubk" data-ce-tag="td" data-cell-header="department">Clothing</td><td class="stk-reset stk-table-cell" data-stk-css="stk_-2S0" data-ce-tag="td" data-cell-header="sale">5</td><td class="stk-reset stk-table-cell" data-stk-css="stkPxs9v" data-ce-tag="td" data-cell-header="avg_s">7.0</td><td class="stk-reset stk-table-cell" data-stk-css="stkfo4P_" data-ce-tag="td" data-cell-header="sum_s">21</td><td class="stk-reset stk-table-cell" data-stk-css="stkCVquh" data-ce-tag="td" data-cell-header="max_s">10</td><td class="stk-reset stk-table-cell" data-stk-css="stkG56kh" data-ce-tag="td" data-cell-header="min_s">5</td><td class="stk-reset stk-table-cell" data-stk-css="stky1Ey9" data-ce-tag="td" data-cell-header="count_s">3</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkSqxUs" data-ce-tag="td" data-cell-header="id">3</td><td class="stk-reset stk-table-cell" data-stk-css="stkVttde" data-ce-tag="td" data-cell-header="sale_date">2024-02-01</td><td class="stk-reset stk-table-cell" data-stk-css="stk014L2" data-ce-tag="td" data-cell-header="department">Equipment</td><td class="stk-reset stk-table-cell" data-stk-css="stkwrFxx" data-ce-tag="td" data-cell-header="sale">10</td><td class="stk-reset stk-table-cell" data-stk-css="stkFGUvu" data-ce-tag="td" data-cell-header="avg_s">7.0</td><td class="stk-reset stk-table-cell" data-stk-css="stkXMqnm" data-ce-tag="td" data-cell-header="sum_s">21</td><td class="stk-reset stk-table-cell" data-stk-css="stkzNB1x" data-ce-tag="td" data-cell-header="max_s">10</td><td class="stk-reset stk-table-cell" data-stk-css="stk1LpN3" data-ce-tag="td" data-cell-header="min_s">5</td><td class="stk-reset stk-table-cell" data-stk-css="stkqOu-G" data-ce-tag="td" data-cell-header="count_s">3</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkzXjFq" data-ce-tag="td" data-cell-header="id">4</td><td class="stk-reset stk-table-cell" data-stk-css="stktkpy3" data-ce-tag="td" data-cell-header="sale_date">2024-02-02</td><td class="stk-reset stk-table-cell" data-stk-css="stkaa44N" data-ce-tag="td" data-cell-header="department">Clothing</td><td class="stk-reset stk-table-cell" data-stk-css="stk2H945" data-ce-tag="td" data-cell-header="sale">6</td><td class="stk-reset stk-table-cell" data-stk-css="stknO7sg" data-ce-tag="td" data-cell-header="avg_s">4.7</td><td class="stk-reset stk-table-cell" data-stk-css="stkllcCL" data-ce-tag="td" data-cell-header="sum_s">14</td><td class="stk-reset stk-table-cell" data-stk-css="stkLxJ0B" data-ce-tag="td" data-cell-header="max_s">6</td><td class="stk-reset stk-table-cell" data-stk-css="stkviDrG" data-ce-tag="td" data-cell-header="min_s">4</td><td class="stk-reset stk-table-cell" data-stk-css="stk9Oa1y" data-ce-tag="td" data-cell-header="count_s">3</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkJe9lo" data-ce-tag="td" data-cell-header="id">5</td><td class="stk-reset stk-table-cell" data-stk-css="stkXAa4f" data-ce-tag="td" data-cell-header="sale_date">2024-02-02</td><td class="stk-reset stk-table-cell" data-stk-css="stkcubl0" data-ce-tag="td" data-cell-header="department">Equipment</td><td class="stk-reset stk-table-cell" data-stk-css="stkeQXI1" data-ce-tag="td" data-cell-header="sale">4</td><td class="stk-reset stk-table-cell" data-stk-css="stkLQBIJ" data-ce-tag="td" data-cell-header="avg_s">4.7</td><td class="stk-reset stk-table-cell" data-stk-css="stkHlzw5" data-ce-tag="td" data-cell-header="sum_s">14</td><td class="stk-reset stk-table-cell" data-stk-css="stk9ce_-" data-ce-tag="td" data-cell-header="max_s">6</td><td class="stk-reset stk-table-cell" data-stk-css="stkAtSBd" data-ce-tag="td" data-cell-header="min_s">4</td><td class="stk-reset stk-table-cell" data-stk-css="stko2m7W" data-ce-tag="td" data-cell-header="count_s">3</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stk-_5qT" data-ce-tag="td" data-cell-header="id">6</td><td class="stk-reset stk-table-cell" data-stk-css="stkau8VM" data-ce-tag="td" data-cell-header="sale_date">2024-02-02</td><td class="stk-reset stk-table-cell" data-stk-css="stkfNGSr" data-ce-tag="td" data-cell-header="department">Shoes</td><td class="stk-reset stk-table-cell" data-stk-css="stkUhQnI" data-ce-tag="td" data-cell-header="sale">4</td><td class="stk-reset stk-table-cell" data-stk-css="stk2aDlQ" data-ce-tag="td" data-cell-header="avg_s">4.7</td><td class="stk-reset stk-table-cell" data-stk-css="stkKeYJl" data-ce-tag="td" data-cell-header="sum_s">14</td><td class="stk-reset stk-table-cell" data-stk-css="stkZ-w6W" data-ce-tag="td" data-cell-header="max_s">6</td><td class="stk-reset stk-table-cell" data-stk-css="stkIdoMA" data-ce-tag="td" data-cell-header="min_s">4</td><td class="stk-reset stk-table-cell" data-stk-css="stk8ziPU" data-ce-tag="td" data-cell-header="count_s">3</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkOJrlW" data-ce-tag="td" data-cell-header="id">7</td><td class="stk-reset stk-table-cell" data-stk-css="stk7Y00M" data-ce-tag="td" data-cell-header="sale_date">2024-02-03</td><td class="stk-reset stk-table-cell" data-stk-css="stkWrq-4" data-ce-tag="td" data-cell-header="department">Shoes</td><td class="stk-reset stk-table-cell" data-stk-css="stknR6rv" data-ce-tag="td" data-cell-header="sale">8</td><td class="stk-reset stk-table-cell" data-stk-css="stka1pJ1" data-ce-tag="td" data-cell-header="avg_s">7.3</td><td class="stk-reset stk-table-cell" data-stk-css="stkrVyLo" data-ce-tag="td" data-cell-header="sum_s">22</td><td class="stk-reset stk-table-cell" data-stk-css="stkGdLxq" data-ce-tag="td" data-cell-header="max_s">10</td><td class="stk-reset stk-table-cell" data-stk-css="stk02zUQ" data-ce-tag="td" data-cell-header="min_s">4</td><td class="stk-reset stk-table-cell" data-stk-css="stkawY-t" data-ce-tag="td" data-cell-header="count_s">3</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkQt_Ep" data-ce-tag="td" data-cell-header="id">8</td><td class="stk-reset stk-table-cell" data-stk-css="stkSuxTK" data-ce-tag="td" data-cell-header="sale_date">2024-02-03</td><td class="stk-reset stk-table-cell" data-stk-css="stk06dQD" data-ce-tag="td" data-cell-header="department">Equipment</td><td class="stk-reset stk-table-cell" data-stk-css="stkCqBv8" data-ce-tag="td" data-cell-header="sale">10</td><td class="stk-reset stk-table-cell" data-stk-css="stki0CdR" data-ce-tag="td" data-cell-header="avg_s">7.3</td><td class="stk-reset stk-table-cell" data-stk-css="stkj1-pa" data-ce-tag="td" data-cell-header="sum_s">22</td><td class="stk-reset stk-table-cell" data-stk-css="stkD-ank" data-ce-tag="td" data-cell-header="max_s">10</td><td class="stk-reset stk-table-cell" data-stk-css="stkis1ut" data-ce-tag="td" data-cell-header="min_s">4</td><td class="stk-reset stk-table-cell" data-stk-css="stkytdtv" data-ce-tag="td" data-cell-header="count_s">3</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stky8vZv" data-ce-tag="td" data-cell-header="id">9</td><td class="stk-reset stk-table-cell" data-stk-css="stknusMT" data-ce-tag="td" data-cell-header="sale_date">2024-02-03</td><td class="stk-reset stk-table-cell" data-stk-css="stkqPCSc" data-ce-tag="td" data-cell-header="department">Clothing</td><td class="stk-reset stk-table-cell" data-stk-css="stkuEz9B" data-ce-tag="td" data-cell-header="sale">4</td><td class="stk-reset stk-table-cell" data-stk-css="stkyMMgQ" data-ce-tag="td" data-cell-header="avg_s">7.3</td><td class="stk-reset stk-table-cell" data-stk-css="stkN-yk_" data-ce-tag="td" data-cell-header="sum_s">22</td><td class="stk-reset stk-table-cell" data-stk-css="stkymayY" data-ce-tag="td" data-cell-header="max_s">10</td><td class="stk-reset stk-table-cell" data-stk-css="stkuSO7z" data-ce-tag="td" data-cell-header="min_s">4</td><td class="stk-reset stk-table-cell" data-stk-css="stkc-uhg" data-ce-tag="td" data-cell-header="count_s">3</td></tr></tbody></table></div><p class="stk-reset" data-ce-tag="paragraph">Важно отметить, что агрегатные функции чувствительны к <u class="stk-reset" data-gtm-vis-has-fired10171822_255="1">NULL</u>. К примеру, <u class="stk-reset" data-gtm-vis-has-fired10171822_255="1">AVG()</u> и <u class="stk-reset" data-gtm-vis-has-fired10171822_255="1">SUM()</u> игнорируют такие значения, а <u class="stk-reset" data-gtm-vis-has-fired10171822_255="1">COUNT()</u> — считает все строки, даже с <u class="stk-reset" data-gtm-vis-has-fired10171822_255="1">NULL</u>.</p><div class="stk-grid__layout_reverse stk-grid valign-middle stk-theme_26309__mb_15" data-stk-css="stkASsfx" data-ce-tag="grid"><div data-col-width="4" class="stk-grid-col stk-grid-col_last valign-middle" data-ce-tag="grid-col" data-stk-css="" data-stk-css-m=""><figure class="stk-reset stk-image-figure" data-ce-tag="image-figure"><div class="stk-mask" data-ce-tag="mask"><img src="/upload/setka_images/13242125062024_db60bdbf69d4db715e427a79d6416cbaedf9ddcb.png" data-image-id="84336" data-image-name="rm4.png" class="stk-image stk-reset" width="372" height="200" loading="lazy"/></div></figure></div><div data-col-width="8" class="stk-grid-col valign-middle" data-ce-tag="grid-col"><p class="stk-reset stk-theme_26309__mb_05 stk-theme_26309__style_font_style-1629726727970" data-ce-tag="paragraph">Читайте также:</p><p class="stk-theme_26309__mb_15 stk-reset stk-theme_26309__style_font_style-1629786048064 stk-theme_26309__style_font_style-1629290372003 stk-theme_26309__color_26309_custom_color_1 article_incut" data-ce-tag="paragraph"><a href="https://skillbox.ru/media/code/null-nol-i-undefined-v-sql-chem-razlichayutsya-i-kak-s-nimi-rabotat/" target="_blank" class="stk-reset">NULL, ноль и undefined в SQL: чем различаются и как с ними работать</a></p></div></div><h3 class="stk-theme_26309__style_medium_header stk-theme_26309__mb_05 stk-reset" data-ce-tag="paragraph"><strong class="stk-reset">Функции ранжирования</strong></h3><p class="stk-reset" data-ce-tag="paragraph">Функции ранжирования предоставляют способы оценки позиции каждой строки среди своих соседей в определённом порядке. Они полезны, когда необходимо определить ранги в наборе данных.</p><p class="stk-reset" data-ce-tag="paragraph">Основные функции ранжирования:</p><p class="stk-reset" data-ce-tag="paragraph"><strong class="stk-reset" data-gtm-vis-has-fired10171822_255="1">Функция</strong> <u class="stk-reset" data-gtm-vis-has-fired10171822_255="1">RANK()</u><strong class="stk-reset" data-gtm-vis-has-fired10171822_255="1">.</strong> Присваивает ранг каждой строке в разделе окна. Если строки одинаковы, они получают одинаковый ранг, но следующий ранг будет увеличен на количество строк с одинаковым рангом.</p><p class="stk-theme_26309__mb_05 stk-reset" data-ce-tag="paragraph">В примере ниже SQL-запрос присваивает строкам ранги в порядке возрастания числа продаж. Если количество продаж одинаковое (<u class="stk-reset">id</u> 5 и 6), то будет присвоен ранг 1, а следующей по порядку строке (<u class="stk-reset">id</u> 4) — ранг 3:</p><figure class="stk-reset stk-embed_rendered" data-ce-tag="embed"><code class="stk-code"><pre class="hljs" style="display: block; overflow-x: auto; padding: 0.5em; background: rgb(0, 0, 0); color: rgb(248, 248, 248);"><span class="hljs-keyword" style="color: rgb(150, 203, 254);">SELECT</span>
id, sale_date, department, sales,
<span class="hljs-keyword" style="color: rgb(255, 115, 253);">RANK</span>() <span class="hljs-keyword" style="color: rgb(150, 203, 254);">OVER</span> (<span class="hljs-keyword" style="color: rgb(150, 203, 254);">PARTITION</span> <span class="hljs-keyword" style="color: rgb(150, 203, 254);">BY</span> sale_date <span class="hljs-keyword" style="color: rgb(150, 203, 254);">ORDER</span> <span class="hljs-keyword" style="color: rgb(150, 203, 254);">BY</span> sales) <span class="hljs-keyword" style="color: rgb(150, 203, 254);">AS</span> rank_s
<span class="hljs-keyword" style="color: rgb(150, 203, 254);">FROM</span> sport_sales;</pre></code><figcaption class="stk-reset stk-description" data-ce-tag="description"></figcaption></figure><p class="stk-theme_26309__mb_05 stk-reset" data-ce-tag="paragraph">Так выглядит таблица с результатом запроса:</p><div class="stk-table-wrap"><table data-responsive-type="scroll" class="stk-table--bordered_h stk-reset stk-table" data-ce-tag="table"><colgroup><col class="stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stkVMWYr" data-stk-id="591"/><col class="stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stkRqXdK" data-stk-id="592"/><col class="stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stk_Qtiq" data-stk-id="593"/><col class="stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stkKGmCb" data-stk-id="594"/><col class="stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stkOFMbN" data-stk-id="595"/></colgroup><thead class="stk-reset"><tr class="stk-reset stk-table-row"><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset">id</strong></th><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset">sale_date</strong></th><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset">department</strong></th><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset">sales</strong></th><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset" data-gtm-vis-has-fired10171822_255="1">rank_s</strong></th></tr></thead><tbody class="stk-reset"><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stk_6vLd" data-ce-tag="td" data-cell-header="id">2</td><td class="stk-reset stk-table-cell" data-stk-css="stk5ExOH" data-ce-tag="td" data-cell-header="sale_date">2024-02-01</td><td class="stk-reset stk-table-cell" data-stk-css="stkUSZUi" data-ce-tag="td" data-cell-header="department">Clothing</td><td class="stk-reset stk-table-cell" data-stk-css="stkc-XqX" data-ce-tag="td" data-cell-header="sales">5</td><td class="stk-reset stk-table-cell" data-stk-css="stkkkQUo" data-ce-tag="td" data-cell-header="rank_s">1</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stku7XGR" data-ce-tag="td" data-cell-header="id">1</td><td class="stk-reset stk-table-cell" data-stk-css="stk31xxX" data-ce-tag="td" data-cell-header="sale_date">2024-02-01</td><td class="stk-reset stk-table-cell" data-stk-css="stkZIOmU" data-ce-tag="td" data-cell-header="department">Shoes</td><td class="stk-reset stk-table-cell" data-stk-css="stktap1e" data-ce-tag="td" data-cell-header="sales">6</td><td class="stk-reset stk-table-cell" data-stk-css="stkqtpbF" data-ce-tag="td" data-cell-header="rank_s">2</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkYM0qK" data-ce-tag="td" data-cell-header="id">3</td><td class="stk-reset stk-table-cell" data-stk-css="stkgZkHI" data-ce-tag="td" data-cell-header="sale_date">2024-02-01</td><td class="stk-reset stk-table-cell" data-stk-css="stkBjF6-" data-ce-tag="td" data-cell-header="department">Equipment</td><td class="stk-reset stk-table-cell" data-stk-css="stkWGk3q" data-ce-tag="td" data-cell-header="sales">10</td><td class="stk-reset stk-table-cell" data-stk-css="stk5hr_c" data-ce-tag="td" data-cell-header="rank_s">3</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkocc7L" data-ce-tag="td" data-cell-header="id">5</td><td class="stk-reset stk-table-cell" data-stk-css="stkakxXB" data-ce-tag="td" data-cell-header="sale_date">2024-02-02</td><td class="stk-reset stk-table-cell" data-stk-css="stkKZTMO" data-ce-tag="td" data-cell-header="department">Equipment</td><td class="stk-reset stk-table-cell" data-stk-css="stkd2At8" data-ce-tag="td" data-cell-header="sales">4</td><td class="stk-reset stk-table-cell" data-stk-css="stkbj0Ls" data-ce-tag="td" data-cell-header="rank_s">1</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stktyEcy" data-ce-tag="td" data-cell-header="id">6</td><td class="stk-reset stk-table-cell" data-stk-css="stkSG9wt" data-ce-tag="td" data-cell-header="sale_date">2024-02-02</td><td class="stk-reset stk-table-cell" data-stk-css="stkDjEOj" data-ce-tag="td" data-cell-header="department">Shoes</td><td class="stk-reset stk-table-cell" data-stk-css="stkeDWDo" data-ce-tag="td" data-cell-header="sales">4</td><td class="stk-reset stk-table-cell" data-stk-css="stkHwWgL" data-ce-tag="td" data-cell-header="rank_s">1</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkyhZ7Y" data-ce-tag="td" data-cell-header="id">4</td><td class="stk-reset stk-table-cell" data-stk-css="stkqPPXC" data-ce-tag="td" data-cell-header="sale_date">2024-02-02</td><td class="stk-reset stk-table-cell" data-stk-css="stkdvUs6" data-ce-tag="td" data-cell-header="department">Clothing</td><td class="stk-reset stk-table-cell" data-stk-css="stk_iT0a" data-ce-tag="td" data-cell-header="sales">6</td><td class="stk-reset stk-table-cell" data-stk-css="stk1_9P4" data-ce-tag="td" data-cell-header="rank_s">3</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkBn-S3" data-ce-tag="td" data-cell-header="id">9</td><td class="stk-reset stk-table-cell" data-stk-css="stkrptNT" data-ce-tag="td" data-cell-header="sale_date">2024-02-03</td><td class="stk-reset stk-table-cell" data-stk-css="stk_76N-" data-ce-tag="td" data-cell-header="department">Clothing</td><td class="stk-reset stk-table-cell" data-stk-css="stkpXlgu" data-ce-tag="td" data-cell-header="sales">4</td><td class="stk-reset stk-table-cell" data-stk-css="stkpEnFs" data-ce-tag="td" data-cell-header="rank_s">1</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stktobmD" data-ce-tag="td" data-cell-header="id">7</td><td class="stk-reset stk-table-cell" data-stk-css="stks7_fL" data-ce-tag="td" data-cell-header="sale_date">2024-02-03</td><td class="stk-reset stk-table-cell" data-stk-css="stk8GoEE" data-ce-tag="td" data-cell-header="department">Shoes</td><td class="stk-reset stk-table-cell" data-stk-css="stkz8468" data-ce-tag="td" data-cell-header="sales">8</td><td class="stk-reset stk-table-cell" data-stk-css="stkzVSZd" data-ce-tag="td" data-cell-header="rank_s">2</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stk6UJ7X" data-ce-tag="td" data-cell-header="id">8</td><td class="stk-reset stk-table-cell" data-stk-css="stkdQZRR" data-ce-tag="td" data-cell-header="sale_date">2024-02-03</td><td class="stk-reset stk-table-cell" data-stk-css="stkPSO7c" data-ce-tag="td" data-cell-header="department">Equipment</td><td class="stk-reset stk-table-cell" data-stk-css="stkgPlS-" data-ce-tag="td" data-cell-header="sales">10</td><td class="stk-reset stk-table-cell" data-stk-css="stkbcQLi" data-ce-tag="td" data-cell-header="rank_s">3</td></tr></tbody></table></div><p class="stk-theme_26309__mb_05 stk-reset" data-ce-tag="paragraph"><strong class="stk-reset" data-gtm-vis-has-fired10171822_255="1">Функция</strong> <strong class="stk-reset" data-gtm-vis-has-fired10171822_255="1"><u class="stk-reset" data-gtm-vis-has-fired10171822_255="1">DENSE_RANK()</u></strong><strong class="stk-reset">.</strong> Похожа на <u class="stk-reset" data-gtm-vis-has-fired10171822_255="1">RANK()</u>, но работает «плотнее». Это значит, что следующий ранг увеличивается на 1, независимо от количества строк с одинаковым рангом.</p><p class="stk-theme_26309__mb_05 stk-reset" data-ce-tag="paragraph">Напишем простой запрос с использованием функции <u class="stk-reset" data-gtm-vis-has-fired10171822_255="1">DENSE_RANK()</u>:</p><figure class="stk-reset stk-embed_rendered" data-ce-tag="embed"><code class="stk-code"><pre class="hljs" style="display: block; overflow-x: auto; padding: 0.5em; background: rgb(0, 0, 0); color: rgb(248, 248, 248);"><span class="hljs-keyword" style="color: rgb(150, 203, 254);">SELECT</span>
id, sale_date, department, sales,
<span class="hljs-keyword" style="color: rgb(255, 115, 253);">DENSE_RANK</span>() <span class="hljs-keyword" style="color: rgb(150, 203, 254);">OVER</span> (<span class="hljs-keyword" style="color: rgb(150, 203, 254);">PARTITION</span> <span class="hljs-keyword" style="color: rgb(150, 203, 254);">BY</span> sale_date <span class="hljs-keyword" style="color: rgb(150, 203, 254);">ORDER</span> <span class="hljs-keyword" style="color: rgb(150, 203, 254);">BY</span> sales) <span class="hljs-keyword" style="color: rgb(150, 203, 254);">AS</span> dn_rank_s
<span class="hljs-keyword" style="color: rgb(150, 203, 254);">FROM</span> sport_sales;</pre></code><figcaption class="stk-reset stk-description" data-ce-tag="description"></figcaption></figure><p class="stk-theme_26309__mb_05 stk-reset" data-ce-tag="paragraph">В этом примере SQL-запрос также присваивает строкам ранг в порядке возрастания количества продаж. Если количество продаж одинаково (<u class="stk-reset">id</u> 5 и 6), то будет присвоен ранг 1, а следующей по порядку строке (<u class="stk-reset">id</u> 4) — ранг 2. Вот как это отражается в таблице:</p><div class="stk-table-wrap"><table data-responsive-type="scroll" class="stk-table--bordered_h stk-reset stk-table" data-ce-tag="table"><colgroup><col class="stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stk3GQIb" data-stk-id="662"/><col class="stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stkLjhBv" data-stk-id="663"/><col class="stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stkGr2Af" data-stk-id="664"/><col class="stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stkmbeiM" data-stk-id="665"/><col class="stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stkSP-vf" data-stk-id="666"/></colgroup><thead class="stk-reset"><tr class="stk-reset stk-table-row"><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset">id</strong></th><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset">sale_date</strong></th><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset">department</strong></th><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset">sales</strong></th><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset" data-gtm-vis-has-fired10171822_255="1">dn_rank_s</strong></th></tr></thead><tbody class="stk-reset"><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkbDQQJ" data-ce-tag="td" data-cell-header="id">2</td><td class="stk-reset stk-table-cell" data-stk-css="stkOHya7" data-ce-tag="td" data-cell-header="sale_date">2024-02-01</td><td class="stk-reset stk-table-cell" data-stk-css="stke7kg1" data-ce-tag="td" data-cell-header="department">Clothing</td><td class="stk-reset stk-table-cell" data-stk-css="stkhreNe" data-ce-tag="td" data-cell-header="sales">5</td><td class="stk-reset stk-table-cell" data-stk-css="stkmXO-M" data-ce-tag="td" data-cell-header="dn_rank_s">1</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkVUJnN" data-ce-tag="td" data-cell-header="id">1</td><td class="stk-reset stk-table-cell" data-stk-css="stkZktH-" data-ce-tag="td" data-cell-header="sale_date">2024-02-01</td><td class="stk-reset stk-table-cell" data-stk-css="stkVnMV2" data-ce-tag="td" data-cell-header="department">Shoes</td><td class="stk-reset stk-table-cell" data-stk-css="stkURg9T" data-ce-tag="td" data-cell-header="sales">6</td><td class="stk-reset stk-table-cell" data-stk-css="stkQPLll" data-ce-tag="td" data-cell-header="dn_rank_s">2</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stk12kU_" data-ce-tag="td" data-cell-header="id">3</td><td class="stk-reset stk-table-cell" data-stk-css="stk-jj3k" data-ce-tag="td" data-cell-header="sale_date">2024-02-01</td><td class="stk-reset stk-table-cell" data-stk-css="stkf_Tom" data-ce-tag="td" data-cell-header="department">Equipment</td><td class="stk-reset stk-table-cell" data-stk-css="stkBWrLR" data-ce-tag="td" data-cell-header="sales">10</td><td class="stk-reset stk-table-cell" data-stk-css="stkuzA28" data-ce-tag="td" data-cell-header="dn_rank_s">3</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkocoLC" data-ce-tag="td" data-cell-header="id">5</td><td class="stk-reset stk-table-cell" data-stk-css="stkCyZEF" data-ce-tag="td" data-cell-header="sale_date">2024-02-02</td><td class="stk-reset stk-table-cell" data-stk-css="stko-Hk2" data-ce-tag="td" data-cell-header="department">Equipment</td><td class="stk-reset stk-table-cell" data-stk-css="stkrE5iV" data-ce-tag="td" data-cell-header="sales">4</td><td class="stk-reset stk-table-cell" data-stk-css="stkpKpha" data-ce-tag="td" data-cell-header="dn_rank_s">1</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkYj5y0" data-ce-tag="td" data-cell-header="id">6</td><td class="stk-reset stk-table-cell" data-stk-css="stkJ1BY-" data-ce-tag="td" data-cell-header="sale_date">2024-02-02</td><td class="stk-reset stk-table-cell" data-stk-css="stkaLuWm" data-ce-tag="td" data-cell-header="department">Shoes</td><td class="stk-reset stk-table-cell" data-stk-css="stkkRCep" data-ce-tag="td" data-cell-header="sales">4</td><td class="stk-reset stk-table-cell" data-stk-css="stkWHwDN" data-ce-tag="td" data-cell-header="dn_rank_s">1</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkNWhSd" data-ce-tag="td" data-cell-header="id">4</td><td class="stk-reset stk-table-cell" data-stk-css="stkUUDL_" data-ce-tag="td" data-cell-header="sale_date">2024-02-02</td><td class="stk-reset stk-table-cell" data-stk-css="stke0to1" data-ce-tag="td" data-cell-header="department">Clothing</td><td class="stk-reset stk-table-cell" data-stk-css="stkM6Zxp" data-ce-tag="td" data-cell-header="sales">6</td><td class="stk-reset stk-table-cell" data-stk-css="stkUkAar" data-ce-tag="td" data-cell-header="dn_rank_s">2</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkOdTbA" data-ce-tag="td" data-cell-header="id">9</td><td class="stk-reset stk-table-cell" data-stk-css="stkDaMdi" data-ce-tag="td" data-cell-header="sale_date">2024-02-03</td><td class="stk-reset stk-table-cell" data-stk-css="stk0Nnu6" data-ce-tag="td" data-cell-header="department">Clothing</td><td class="stk-reset stk-table-cell" data-stk-css="stkz8R-u" data-ce-tag="td" data-cell-header="sales">4</td><td class="stk-reset stk-table-cell" data-stk-css="stkp2dWq" data-ce-tag="td" data-cell-header="dn_rank_s">1</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkg31wo" data-ce-tag="td" data-cell-header="id">7</td><td class="stk-reset stk-table-cell" data-stk-css="stkwr2Kh" data-ce-tag="td" data-cell-header="sale_date">2024-02-03</td><td class="stk-reset stk-table-cell" data-stk-css="stk1piCe" data-ce-tag="td" data-cell-header="department">Shoes</td><td class="stk-reset stk-table-cell" data-stk-css="stk9QL_u" data-ce-tag="td" data-cell-header="sales">8</td><td class="stk-reset stk-table-cell" data-stk-css="stkbJ5fy" data-ce-tag="td" data-cell-header="dn_rank_s">2</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkI0DEC" data-ce-tag="td" data-cell-header="id">8</td><td class="stk-reset stk-table-cell" data-stk-css="stkOMAGD" data-ce-tag="td" data-cell-header="sale_date">2024-02-03</td><td class="stk-reset stk-table-cell" data-stk-css="stkUWP4M" data-ce-tag="td" data-cell-header="department">Equipment</td><td class="stk-reset stk-table-cell" data-stk-css="stkfoGcW" data-ce-tag="td" data-cell-header="sales">10</td><td class="stk-reset stk-table-cell" data-stk-css="stkVK2kD" data-ce-tag="td" data-cell-header="dn_rank_s">3</td></tr></tbody></table></div><p class="stk-reset" data-ce-tag="paragraph"><strong class="stk-reset" data-gtm-vis-has-fired10171822_255="1">Функция</strong> <strong class="stk-reset" data-gtm-vis-has-fired10171822_255="1"><u class="stk-reset" data-gtm-vis-has-fired10171822_255="1">ROW_NUMBER()</u></strong><strong class="stk-reset">.</strong> Присваивает уникальный порядковый номер каждой строке в разделе окна.</p><p class="stk-theme_26309__mb_05 stk-reset" data-ce-tag="paragraph">SQL-запрос выглядит следующим образом:</p><figure class="stk-reset stk-embed_rendered" data-ce-tag="embed"><code class="stk-code"><pre class="hljs" style="display: block; overflow-x: auto; padding: 0.5em; background: rgb(0, 0, 0); color: rgb(248, 248, 248);"><span class="hljs-keyword" style="color: rgb(150, 203, 254);">SELECT</span>
id, sale_date, department, sale,
<span class="hljs-keyword" style="color: rgb(255, 115, 253);">ROW_NUMBER</span>() <span class="hljs-keyword" style="color: rgb(150, 203, 254);">OVER</span> (<span class="hljs-keyword" style="color: rgb(150, 203, 254);">PARTITION</span> <span class="hljs-keyword" style="color: rgb(150, 203, 254);">BY</span> sale_date <span class="hljs-keyword" style="color: rgb(150, 203, 254);">ORDER</span> <span class="hljs-keyword" style="color: rgb(150, 203, 254);">BY</span> department) <span class="hljs-keyword" style="color: rgb(150, 203, 254);">AS</span> row_n
<span class="hljs-keyword" style="color: rgb(150, 203, 254);">FROM</span> sport_sales;</pre></code><figcaption class="stk-reset stk-description" data-ce-tag="description"></figcaption></figure><p class="stk-theme_26309__mb_05 stk-reset" data-ce-tag="paragraph">В результате все данные рассортированы по датам продаж и отмечены уникальными номерами:</p><div class="stk-table-wrap stk-theme_26309__mb_15"><table data-responsive-type="scroll" class="stk-table--bordered_h stk-reset stk-table" data-ce-tag="table"><colgroup><col class="stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stkyYARY" data-stk-id="733"/><col class="stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stkTPmjH" data-stk-id="734"/><col class="stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stkSUHNo" data-stk-id="735"/><col class="stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stkIpn45" data-stk-id="736"/><col class="stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stkK5sa3" data-stk-id="737"/></colgroup><thead class="stk-reset"><tr class="stk-reset stk-table-row"><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset">id</strong></th><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset">sale_date</strong></th><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset">department</strong></th><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset">sales</strong></th><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset">r<strong class="stk-reset">ow_n</strong></strong></th></tr></thead><tbody class="stk-reset"><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkGr2KO" data-ce-tag="td" data-cell-header="id">2</td><td class="stk-reset stk-table-cell" data-stk-css="stkK0epB" data-ce-tag="td" data-cell-header="sale_date">2024-02-01</td><td class="stk-reset stk-table-cell" data-stk-css="stk8ReJw" data-ce-tag="td" data-cell-header="department">Clothing</td><td class="stk-reset stk-table-cell" data-stk-css="stkLh3YQ" data-ce-tag="td" data-cell-header="sales">5</td><td class="stk-reset stk-table-cell" data-stk-css="stkwdOyZ" data-ce-tag="td" data-cell-header="row_n">1</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkM0VTY" data-ce-tag="td" data-cell-header="id">3</td><td class="stk-reset stk-table-cell" data-stk-css="stkeh1z2" data-ce-tag="td" data-cell-header="sale_date">2024-02-01</td><td class="stk-reset stk-table-cell" data-stk-css="stkOYj_E" data-ce-tag="td" data-cell-header="department">Equipment</td><td class="stk-reset stk-table-cell" data-stk-css="stkRtRCJ" data-ce-tag="td" data-cell-header="sales">10</td><td class="stk-reset stk-table-cell" data-stk-css="stkQkAT4" data-ce-tag="td" data-cell-header="row_n">2</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkxGMpQ" data-ce-tag="td" data-cell-header="id">1</td><td class="stk-reset stk-table-cell" data-stk-css="stkg1KBO" data-ce-tag="td" data-cell-header="sale_date">2024-02-01</td><td class="stk-reset stk-table-cell" data-stk-css="stk_IjBY" data-ce-tag="td" data-cell-header="department">Shoes</td><td class="stk-reset stk-table-cell" data-stk-css="stkVaGJJ" data-ce-tag="td" data-cell-header="sales">6</td><td class="stk-reset stk-table-cell" data-stk-css="stk8w_7m" data-ce-tag="td" data-cell-header="row_n">3</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkca9ZO" data-ce-tag="td" data-cell-header="id">4</td><td class="stk-reset stk-table-cell" data-stk-css="stkWhFWd" data-ce-tag="td" data-cell-header="sale_date">2024-02-02</td><td class="stk-reset stk-table-cell" data-stk-css="stkLlT7B" data-ce-tag="td" data-cell-header="department">Clothing</td><td class="stk-reset stk-table-cell" data-stk-css="stkZnsJs" data-ce-tag="td" data-cell-header="sales">6</td><td class="stk-reset stk-table-cell" data-stk-css="stkaLMDR" data-ce-tag="td" data-cell-header="row_n">1</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkykwEi" data-ce-tag="td" data-cell-header="id">5</td><td class="stk-reset stk-table-cell" data-stk-css="stkY5ZKM" data-ce-tag="td" data-cell-header="sale_date">2024-02-02</td><td class="stk-reset stk-table-cell" data-stk-css="stkeq6-Z" data-ce-tag="td" data-cell-header="department">Equipment</td><td class="stk-reset stk-table-cell" data-stk-css="stkjTM9S" data-ce-tag="td" data-cell-header="sales">4</td><td class="stk-reset stk-table-cell" data-stk-css="stkyrJw-" data-ce-tag="td" data-cell-header="row_n">2</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stk-SZMT" data-ce-tag="td" data-cell-header="id">6</td><td class="stk-reset stk-table-cell" data-stk-css="stkTqMid" data-ce-tag="td" data-cell-header="sale_date">2024-02-02</td><td class="stk-reset stk-table-cell" data-stk-css="stkV83jr" data-ce-tag="td" data-cell-header="department">Shoes</td><td class="stk-reset stk-table-cell" data-stk-css="stkl7sJh" data-ce-tag="td" data-cell-header="sales">4</td><td class="stk-reset stk-table-cell" data-stk-css="stkakPNk" data-ce-tag="td" data-cell-header="row_n">3</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stk3qehQ" data-ce-tag="td" data-cell-header="id">9</td><td class="stk-reset stk-table-cell" data-stk-css="stklZzZN" data-ce-tag="td" data-cell-header="sale_date">2024-02-03</td><td class="stk-reset stk-table-cell" data-stk-css="stkv7rGl" data-ce-tag="td" data-cell-header="department">Clothing</td><td class="stk-reset stk-table-cell" data-stk-css="stk2kUmR" data-ce-tag="td" data-cell-header="sales">4</td><td class="stk-reset stk-table-cell" data-stk-css="stk1Uzxx" data-ce-tag="td" data-cell-header="row_n">1</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkavc1Y" data-ce-tag="td" data-cell-header="id">8</td><td class="stk-reset stk-table-cell" data-stk-css="stkurNj0" data-ce-tag="td" data-cell-header="sale_date">2024-02-03</td><td class="stk-reset stk-table-cell" data-stk-css="stkxmDfI" data-ce-tag="td" data-cell-header="department">Equipment</td><td class="stk-reset stk-table-cell" data-stk-css="stkl0Exo" data-ce-tag="td" data-cell-header="sales">10</td><td class="stk-reset stk-table-cell" data-stk-css="stkdccrG" data-ce-tag="td" data-cell-header="row_n">2</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkQ3n1a" data-ce-tag="td" data-cell-header="id">7</td><td class="stk-reset stk-table-cell" data-stk-css="stkppI8D" data-ce-tag="td" data-cell-header="sale_date">2024-02-03</td><td class="stk-reset stk-table-cell" data-stk-css="stk3sdJw" data-ce-tag="td" data-cell-header="department">Shoes</td><td class="stk-reset stk-table-cell" data-stk-css="stkjLyEB" data-ce-tag="td" data-cell-header="sales">8</td><td class="stk-reset stk-table-cell" data-stk-css="stkmZYLd" data-ce-tag="td" data-cell-header="row_n">3</td></tr></tbody></table></div><h3 class="stk-theme_26309__style_medium_header stk-theme_26309__mb_05 stk-reset" data-ce-tag="paragraph"><strong class="stk-reset">Функции смещения</strong></h3><p class="stk-reset" data-ce-tag="paragraph">Функции смещения позволяют выполнять операции над текущей строкой, в зависимости от других строк в окне. Они бывают полезны, когда нужно анализировать последовательности или временные ряды данных.</p><p class="stk-reset" data-ce-tag="paragraph">Основные функции смещения:</p><p class="stk-reset" data-ce-tag="paragraph"><strong class="stk-reset" data-gtm-vis-has-fired10171822_255="1">Функция</strong> <strong class="stk-reset" data-gtm-vis-has-fired10171822_255="1"><u class="stk-reset" data-gtm-vis-has-fired10171822_255="1">LEAD()</u></strong><strong class="stk-reset">.</strong> Позволяет заглянуть вперёд на определённое количество строк от текущей и получить значение из столбца в этих строках.</p><p class="stk-theme_26309__mb_05 stk-reset" data-ce-tag="paragraph">К примеру, запрос может выглядеть следующим образом:</p><figure class="stk-reset stk-embed_rendered" data-ce-tag="embed"><code class="stk-code"><pre class="hljs" style="display: block; overflow-x: auto; padding: 0.5em; background: rgb(0, 0, 0); color: rgb(248, 248, 248);"><span class="hljs-keyword" style="color: rgb(150, 203, 254);">SELECT</span> id, sale_date, department, sales,
<span class="hljs-keyword" style="color: rgb(255, 115, 253);">LEAD</span>(sales, <span class="hljs-number" style="color: rgb(255, 115, 253);">1</span>) <span class="hljs-keyword" style="color: rgb(150, 203, 254);">OVER</span> (<span class="hljs-keyword" style="color: rgb(150, 203, 254);">PARTITION</span> <span class="hljs-keyword" style="color: rgb(150, 203, 254);">BY</span> department <span class="hljs-keyword" style="color: rgb(150, 203, 254);">ORDER</span> <span class="hljs-keyword" style="color: rgb(150, 203, 254);">BY</span> sale_date) <span class="hljs-keyword" style="color: rgb(150, 203, 254);">AS</span> next_day_s
<span class="hljs-keyword" style="color: rgb(150, 203, 254);">FROM</span> sport_sales;
</pre></code><figcaption class="stk-reset stk-description" data-ce-tag="description"></figcaption></figure><p class="stk-theme_26309__mb_05 stk-reset" data-ce-tag="paragraph">В результате для каждого отдела запрос возвращает продажи текущего дня (<u class="stk-reset">sales</u>) и следующего (<u class="stk-reset">next_day_s</u>):</p><div class="stk-table-wrap"><table data-responsive-type="scroll" class="stk-table--bordered_h stk-reset stk-table" data-ce-tag="table"><colgroup><col class="stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stk6gMGM" data-stk-id="807"/><col class="stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stkaxMMf" data-stk-id="808"/><col class="stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stk20S0D" data-stk-id="809"/><col class="stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stk62keD" data-stk-id="810"/><col class="stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stkiNnRr" data-stk-id="811"/></colgroup><thead class="stk-reset"><tr class="stk-reset stk-table-row"><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset">id</strong></th><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset">sale_date</strong></th><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset">department</strong></th><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset">sales</strong></th><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset" data-gtm-vis-has-fired10171822_255="1">next_day_s</strong></th></tr></thead><tbody class="stk-reset"><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkBki60" data-ce-tag="td" data-cell-header="id">2</td><td class="stk-reset stk-table-cell" data-stk-css="stkhVP10" data-ce-tag="td" data-cell-header="sale_date">2024-02-01</td><td class="stk-reset stk-table-cell" data-stk-css="stklvu-6" data-ce-tag="td" data-cell-header="department">Clothing</td><td class="stk-reset stk-table-cell" data-stk-css="stkeFe1L" data-ce-tag="td" data-cell-header="sales">5</td><td class="stk-reset stk-table-cell" data-stk-css="stk6N8r5" data-ce-tag="td" data-cell-header="next_day_s">6</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkT-IVo" data-ce-tag="td" data-cell-header="id">4</td><td class="stk-reset stk-table-cell" data-stk-css="stkgq9L0" data-ce-tag="td" data-cell-header="sale_date">2024-02-02</td><td class="stk-reset stk-table-cell" data-stk-css="stkGYoIm" data-ce-tag="td" data-cell-header="department">Clothing</td><td class="stk-reset stk-table-cell" data-stk-css="stkQpHu-" data-ce-tag="td" data-cell-header="sales">6</td><td class="stk-reset stk-table-cell" data-stk-css="stkl0LvE" data-ce-tag="td" data-cell-header="next_day_s">4</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stknDtMS" data-ce-tag="td" data-cell-header="id">9</td><td class="stk-reset stk-table-cell" data-stk-css="stkpM0FG" data-ce-tag="td" data-cell-header="sale_date">2024-02-03</td><td class="stk-reset stk-table-cell" data-stk-css="stkdqMLH" data-ce-tag="td" data-cell-header="department">Clothing</td><td class="stk-reset stk-table-cell" data-stk-css="stkCUjL8" data-ce-tag="td" data-cell-header="sales">4</td><td class="stk-reset stk-table-cell" data-stk-css="stk-dzdd" data-ce-tag="td" data-cell-header="next_day_s">None</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkU33FC" data-ce-tag="td" data-cell-header="id">3</td><td class="stk-reset stk-table-cell" data-stk-css="stkvlBgV" data-ce-tag="td" data-cell-header="sale_date">2024-02-01</td><td class="stk-reset stk-table-cell" data-stk-css="stk0fKQ-" data-ce-tag="td" data-cell-header="department">Equipment</td><td class="stk-reset stk-table-cell" data-stk-css="stkKxTpM" data-ce-tag="td" data-cell-header="sales">10</td><td class="stk-reset stk-table-cell" data-stk-css="stkgEe4i" data-ce-tag="td" data-cell-header="next_day_s">4</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkpnNl1" data-ce-tag="td" data-cell-header="id">5</td><td class="stk-reset stk-table-cell" data-stk-css="stk22_V7" data-ce-tag="td" data-cell-header="sale_date">2024-02-02</td><td class="stk-reset stk-table-cell" data-stk-css="stkzwdtd" data-ce-tag="td" data-cell-header="department">Equipment</td><td class="stk-reset stk-table-cell" data-stk-css="stkRR2di" data-ce-tag="td" data-cell-header="sales">4</td><td class="stk-reset stk-table-cell" data-stk-css="stk1Wg9c" data-ce-tag="td" data-cell-header="next_day_s">10</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkUH3nJ" data-ce-tag="td" data-cell-header="id">8</td><td class="stk-reset stk-table-cell" data-stk-css="stkqQ4yf" data-ce-tag="td" data-cell-header="sale_date">2024-02-03</td><td class="stk-reset stk-table-cell" data-stk-css="stk60Ljw" data-ce-tag="td" data-cell-header="department">Equipment</td><td class="stk-reset stk-table-cell" data-stk-css="stk-b9P9" data-ce-tag="td" data-cell-header="sales">10</td><td class="stk-reset stk-table-cell" data-stk-css="stkp5tm3" data-ce-tag="td" data-cell-header="next_day_s">None</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stk0SfGx" data-ce-tag="td" data-cell-header="id">1</td><td class="stk-reset stk-table-cell" data-stk-css="stk47C1b" data-ce-tag="td" data-cell-header="sale_date">2024-02-01</td><td class="stk-reset stk-table-cell" data-stk-css="stkvKQZl" data-ce-tag="td" data-cell-header="department">Shoes</td><td class="stk-reset stk-table-cell" data-stk-css="stkDY046" data-ce-tag="td" data-cell-header="sales">6</td><td class="stk-reset stk-table-cell" data-stk-css="stklzhC_" data-ce-tag="td" data-cell-header="next_day_s">4</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkcd5sd" data-ce-tag="td" data-cell-header="id">6</td><td class="stk-reset stk-table-cell" data-stk-css="stkjxgch" data-ce-tag="td" data-cell-header="sale_date">2024-02-02</td><td class="stk-reset stk-table-cell" data-stk-css="stkfvwqQ" data-ce-tag="td" data-cell-header="department">Shoes</td><td class="stk-reset stk-table-cell" data-stk-css="stkO3yNu" data-ce-tag="td" data-cell-header="sales">4</td><td class="stk-reset stk-table-cell" data-stk-css="stkzD3M5" data-ce-tag="td" data-cell-header="next_day_s">8</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stk0WeSc" data-ce-tag="td" data-cell-header="id">7</td><td class="stk-reset stk-table-cell" data-stk-css="stkC0WGe" data-ce-tag="td" data-cell-header="sale_date">2024-02-03</td><td class="stk-reset stk-table-cell" data-stk-css="stkhv9lv" data-ce-tag="td" data-cell-header="department">Shoes</td><td class="stk-reset stk-table-cell" data-stk-css="stkr5s4L" data-ce-tag="td" data-cell-header="sales">8</td><td class="stk-reset stk-table-cell" data-stk-css="stkXwXYG" data-ce-tag="td" data-cell-header="next_day_s">None</td></tr></tbody></table></div><p class="stk-reset" data-ce-tag="paragraph"><strong class="stk-reset" data-gtm-vis-has-fired10171822_255="1">Функция</strong> <strong class="stk-reset" data-gtm-vis-has-fired10171822_255="1"><u class="stk-reset" data-gtm-vis-has-fired10171822_255="1">LAG()</u></strong><strong class="stk-reset">.</strong> Похожа на <u class="stk-reset" data-gtm-vis-has-fired10171822_255="1">LEAD()</u>, но, вместо того чтобы «заглядывать вперёд», эта функция «смотрит назад» на определённое количество строк.</p><p class="stk-theme_26309__mb_05 stk-reset" data-ce-tag="paragraph">Здесь в каждой строке окна столбец <u class="stk-reset">sales</u> покажет продажи текущего, а столбец <u class="stk-reset">last_day_s</u> — продажи предыдущего дня для каждого отдела:</p><div class="stk-table-wrap"><table data-responsive-type="scroll" class="stk-table--bordered_h stk-reset stk-table" data-ce-tag="table"><colgroup><col class="stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stkL6YSY" data-stk-id="875"/><col class="stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stkVyQn_" data-stk-id="876"/><col class="stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stkS0JHx" data-stk-id="877"/><col class="stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stkW__ZC" data-stk-id="878"/><col class="stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stkgasjZ" data-stk-id="879"/></colgroup><thead class="stk-reset"><tr class="stk-reset stk-table-row"><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset">id</strong></th><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset">sale_date</strong></th><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset">department</strong></th><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset">sales</strong></th><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset">last_day_s</strong></th></tr></thead><tbody class="stk-reset"><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkzP2Pa" data-ce-tag="td" data-cell-header="id">2</td><td class="stk-reset stk-table-cell" data-stk-css="stkiQRbd" data-ce-tag="td" data-cell-header="sale_date">2024-02-01</td><td class="stk-reset stk-table-cell" data-stk-css="stkDKtBj" data-ce-tag="td" data-cell-header="department">Clothing</td><td class="stk-reset stk-table-cell" data-stk-css="stkCIXGp" data-ce-tag="td" data-cell-header="sales">5</td><td class="stk-reset stk-table-cell" data-stk-css="stk4L-vq" data-ce-tag="td" data-cell-header="last_day_s">None</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkCdmXW" data-ce-tag="td" data-cell-header="id">4</td><td class="stk-reset stk-table-cell" data-stk-css="stkY3xiy" data-ce-tag="td" data-cell-header="sale_date">2024-02-02</td><td class="stk-reset stk-table-cell" data-stk-css="stkbNvJY" data-ce-tag="td" data-cell-header="department">Clothing</td><td class="stk-reset stk-table-cell" data-stk-css="stkGR8Mo" data-ce-tag="td" data-cell-header="sales">6</td><td class="stk-reset stk-table-cell" data-stk-css="stkK_top" data-ce-tag="td" data-cell-header="last_day_s">5</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkpt6TQ" data-ce-tag="td" data-cell-header="id">9</td><td class="stk-reset stk-table-cell" data-stk-css="stkH9XQB" data-ce-tag="td" data-cell-header="sale_date">2024-02-03</td><td class="stk-reset stk-table-cell" data-stk-css="stk88mX9" data-ce-tag="td" data-cell-header="department">Clothing</td><td class="stk-reset stk-table-cell" data-stk-css="stk68iqM" data-ce-tag="td" data-cell-header="sales">4</td><td class="stk-reset stk-table-cell" data-stk-css="stkUahFt" data-ce-tag="td" data-cell-header="last_day_s">6</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkmKXX1" data-ce-tag="td" data-cell-header="id">3</td><td class="stk-reset stk-table-cell" data-stk-css="stkdrezX" data-ce-tag="td" data-cell-header="sale_date">2024-02-01</td><td class="stk-reset stk-table-cell" data-stk-css="stkB6_k2" data-ce-tag="td" data-cell-header="department">Equipment</td><td class="stk-reset stk-table-cell" data-stk-css="stkJ9e9c" data-ce-tag="td" data-cell-header="sales">10</td><td class="stk-reset stk-table-cell" data-stk-css="stkr1Y6Y" data-ce-tag="td" data-cell-header="last_day_s">None</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkHjWxY" data-ce-tag="td" data-cell-header="id">5</td><td class="stk-reset stk-table-cell" data-stk-css="stkhi75_" data-ce-tag="td" data-cell-header="sale_date">2024-02-02</td><td class="stk-reset stk-table-cell" data-stk-css="stktJ-_X" data-ce-tag="td" data-cell-header="department">Equipment</td><td class="stk-reset stk-table-cell" data-stk-css="stkja5OD" data-ce-tag="td" data-cell-header="sales">4</td><td class="stk-reset stk-table-cell" data-stk-css="stkdpx7j" data-ce-tag="td" data-cell-header="last_day_s">10</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkj2asU" data-ce-tag="td" data-cell-header="id">8</td><td class="stk-reset stk-table-cell" data-stk-css="stk4cD_V" data-ce-tag="td" data-cell-header="sale_date">2024-02-03</td><td class="stk-reset stk-table-cell" data-stk-css="stkYkY8g" data-ce-tag="td" data-cell-header="department">Equipment</td><td class="stk-reset stk-table-cell" data-stk-css="stkOHspk" data-ce-tag="td" data-cell-header="sales">10</td><td class="stk-reset stk-table-cell" data-stk-css="stkJ4TxD" data-ce-tag="td" data-cell-header="last_day_s">4</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkB2LvK" data-ce-tag="td" data-cell-header="id">1</td><td class="stk-reset stk-table-cell" data-stk-css="stkhwBeW" data-ce-tag="td" data-cell-header="sale_date">2024-02-01</td><td class="stk-reset stk-table-cell" data-stk-css="stkDeZou" data-ce-tag="td" data-cell-header="department">Shoes</td><td class="stk-reset stk-table-cell" data-stk-css="stkshJrK" data-ce-tag="td" data-cell-header="sales">6</td><td class="stk-reset stk-table-cell" data-stk-css="stkb7vhC" data-ce-tag="td" data-cell-header="last_day_s">None</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkwuMHF" data-ce-tag="td" data-cell-header="id">6</td><td class="stk-reset stk-table-cell" data-stk-css="stkuih28" data-ce-tag="td" data-cell-header="sale_date">2024-02-02</td><td class="stk-reset stk-table-cell" data-stk-css="stkidUDq" data-ce-tag="td" data-cell-header="department">Shoes</td><td class="stk-reset stk-table-cell" data-stk-css="stkEFtGw" data-ce-tag="td" data-cell-header="sales">4</td><td class="stk-reset stk-table-cell" data-stk-css="stknsri0" data-ce-tag="td" data-cell-header="last_day_s">6</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkgnhiB" data-ce-tag="td" data-cell-header="id">7</td><td class="stk-reset stk-table-cell" data-stk-css="stkA-2eq" data-ce-tag="td" data-cell-header="sale_date">2024-02-03</td><td class="stk-reset stk-table-cell" data-stk-css="stkxZ0tv" data-ce-tag="td" data-cell-header="department">Shoes</td><td class="stk-reset stk-table-cell" data-stk-css="stk2CUIR" data-ce-tag="td" data-cell-header="sales">8</td><td class="stk-reset stk-table-cell" data-stk-css="stkbk1Hc" data-ce-tag="td" data-cell-header="last_day_s">4</td></tr></tbody></table></div><p class="stk-reset" data-ce-tag="paragraph"><strong class="stk-reset" data-gtm-vis-has-fired10171822_255="1">Функции</strong> <strong class="stk-reset" data-gtm-vis-has-fired10171822_255="1"><u class="stk-reset" data-gtm-vis-has-fired10171822_255="1">FIRST_VALUE()</u> и</strong> <strong class="stk-reset" data-gtm-vis-has-fired10171822_255="1"><u class="stk-reset" data-gtm-vis-has-fired10171822_255="1">LAST_VALUE()</u>.</strong> Эти функции возвращают первое и последнее значение столбца в окне соответственно.</p><p class="stk-theme_26309__mb_05 stk-reset" data-ce-tag="paragraph">С помощью вот такого запроса можно вывести продажи текущего дня и продажи за первое и третье число для каждого отдела:</p><figure class="stk-reset stk-embed_rendered" data-ce-tag="embed"><code class="stk-code"><pre class="hljs" style="display: block; overflow-x: auto; padding: 0.5em; background: rgb(0, 0, 0); color: rgb(248, 248, 248);"><span class="hljs-keyword" style="color: rgb(150, 203, 254);">SELECT</span> id, sale_date, department, sale,
<span class="hljs-keyword" style="color: rgb(255, 115, 253);">FIRST_VALUE</span>(sale) <span class="hljs-keyword" style="color: rgb(150, 203, 254);">OVER</span> (<span class="hljs-keyword" style="color: rgb(150, 203, 254);">PARTITION</span> <span class="hljs-keyword" style="color: rgb(150, 203, 254);">BY</span> department <span class="hljs-keyword" style="color: rgb(150, 203, 254);">ORDER</span> <span class="hljs-keyword" style="color: rgb(150, 203, 254);">BY</span> sale_date) <span class="hljs-keyword" style="color: rgb(150, 203, 254);">AS</span> first_sale,
<span class="hljs-keyword" style="color: rgb(255, 115, 253);">LAST_VALUE</span>(sale) <span class="hljs-keyword" style="color: rgb(150, 203, 254);">OVER</span> (<span class="hljs-keyword" style="color: rgb(150, 203, 254);">PARTITION</span> <span class="hljs-keyword" style="color: rgb(150, 203, 254);">BY</span> department <span class="hljs-keyword" style="color: rgb(150, 203, 254);">ORDER</span> <span class="hljs-keyword" style="color: rgb(150, 203, 254);">BY</span> sale_date) <span class="hljs-keyword" style="color: rgb(150, 203, 254);">AS</span> last_sale
<span class="hljs-keyword" style="color: rgb(150, 203, 254);">FROM</span> sport_sales;</pre></code><figcaption class="stk-reset stk-description" data-ce-tag="description"></figcaption></figure><p class="stk-theme_26309__mb_05 stk-reset" data-ce-tag="paragraph">Результат работы запроса выглядит так:</p><div class="stk-table-wrap stk-theme_26309__mb_15"><table data-responsive-type="scroll" class="stk-table--bordered_h stk-reset stk-table" data-ce-tag="table"><colgroup><col class="stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stk5J0a4" data-stk-id="946"/><col class="stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stkC-HAy" data-stk-id="947"/><col class="stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stkihry2" data-stk-id="948"/><col class="stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stkJn3Jb" data-stk-id="949"/><col class="stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stkMFqHR" data-stk-id="950"/><col class="stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset stk-reset" data-stk-css="stkmRjC9" data-stk-id="951"/></colgroup><thead class="stk-reset"><tr class="stk-reset stk-table-row"><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset">id</strong></th><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset">sale_date</strong></th><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset">department</strong></th><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset">sales</strong></th><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset">first_sale</strong></th><th class="stk-reset stk-table-cell" data-ce-tag="th"><strong class="stk-reset">last_sale</strong></th></tr></thead><tbody class="stk-reset"><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-ce-tag="td" data-cell-header="id" data-stk-css="stkA9i0n">2</td><td class="stk-reset stk-table-cell" data-ce-tag="td" data-cell-header="sale_date" data-stk-css="stkOvpwg">2024-02-01</td><td class="stk-reset stk-table-cell" data-ce-tag="td" data-cell-header="department" data-stk-css="stkwsiDc">Clothing</td><td class="stk-reset stk-table-cell" data-ce-tag="td" data-cell-header="sales" data-stk-css="stkschzF">5</td><td class="stk-reset stk-table-cell" data-ce-tag="td" data-stk-css="stkzlYu0" data-cell-header="first_sale">5</td><td class="stk-reset stk-table-cell" data-ce-tag="td" data-cell-header="last_sale" data-stk-css="stkQ4qXk">4</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-ce-tag="td" data-cell-header="id" data-stk-css="stkc4jvM">4</td><td class="stk-reset stk-table-cell" data-ce-tag="td" data-cell-header="sale_date" data-stk-css="stkNCU97">2024-02-02</td><td class="stk-reset stk-table-cell" data-ce-tag="td" data-cell-header="department" data-stk-css="stk_Cnjs">Clothing</td><td class="stk-reset stk-table-cell" data-ce-tag="td" data-cell-header="sales" data-stk-css="stk-QeUn">6</td><td class="stk-reset stk-table-cell" data-ce-tag="td" data-stk-css="stkJ_CfR" data-cell-header="first_sale">5</td><td class="stk-reset stk-table-cell" data-ce-tag="td" data-cell-header="last_sale" data-stk-css="stkcDzqX">4</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-ce-tag="td" data-cell-header="id" data-stk-css="stkF40fm">9</td><td class="stk-reset stk-table-cell" data-ce-tag="td" data-cell-header="sale_date" data-stk-css="stkq3gYV">2024-02-03</td><td class="stk-reset stk-table-cell" data-ce-tag="td" data-cell-header="department" data-stk-css="stkw7Kwm">Clothing</td><td class="stk-reset stk-table-cell" data-ce-tag="td" data-cell-header="sales" data-stk-css="stkBOnoG">4</td><td class="stk-reset stk-table-cell" data-ce-tag="td" data-stk-css="stkw-aIS" data-cell-header="first_sale">5</td><td class="stk-reset stk-table-cell" data-ce-tag="td" data-cell-header="last_sale" data-stk-css="stkNHuOz">4</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkc9W71" data-ce-tag="td" data-cell-header="id">3</td><td class="stk-reset stk-table-cell" data-stk-css="stke6NWo" data-ce-tag="td" data-cell-header="sale_date">2024-02-01</td><td class="stk-reset stk-table-cell" data-stk-css="stkZtNUN" data-ce-tag="td" data-cell-header="department">Equipment</td><td class="stk-reset stk-table-cell" data-stk-css="stkJdiCQ" data-ce-tag="td" data-cell-header="sales">10</td><td class="stk-reset stk-table-cell" data-ce-tag="td" data-stk-css="stkdi9R3" data-cell-header="first_sale">10</td><td class="stk-reset stk-table-cell" data-stk-css="stkcE68I" data-ce-tag="td" data-cell-header="last_sale">10</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkw4RyE" data-ce-tag="td" data-cell-header="id">5</td><td class="stk-reset stk-table-cell" data-stk-css="stkDCaNc" data-ce-tag="td" data-cell-header="sale_date">2024-02-02</td><td class="stk-reset stk-table-cell" data-stk-css="stkWq8hx" data-ce-tag="td" data-cell-header="department">Equipment</td><td class="stk-reset stk-table-cell" data-stk-css="stkBcOHu" data-ce-tag="td" data-cell-header="sales">4</td><td class="stk-reset stk-table-cell" data-ce-tag="td" data-stk-css="stkCjpXj" data-cell-header="first_sale">10</td><td class="stk-reset stk-table-cell" data-stk-css="stkM9v6G" data-ce-tag="td" data-cell-header="last_sale">10</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stk0S5Nv" data-ce-tag="td" data-cell-header="id">8</td><td class="stk-reset stk-table-cell" data-stk-css="stknfNFf" data-ce-tag="td" data-cell-header="sale_date">2024-02-03</td><td class="stk-reset stk-table-cell" data-stk-css="stktFPRK" data-ce-tag="td" data-cell-header="department">Equipment</td><td class="stk-reset stk-table-cell" data-stk-css="stkbJoCe" data-ce-tag="td" data-cell-header="sales">10</td><td class="stk-reset stk-table-cell" data-ce-tag="td" data-stk-css="stk8FTbD" data-cell-header="first_sale">10</td><td class="stk-reset stk-table-cell" data-stk-css="stkKsdkH" data-ce-tag="td" data-cell-header="last_sale">10</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkyJRMH" data-ce-tag="td" data-cell-header="id">1</td><td class="stk-reset stk-table-cell" data-stk-css="stkkehOg" data-ce-tag="td" data-cell-header="sale_date">2024-02-01</td><td class="stk-reset stk-table-cell" data-stk-css="stkPLBUP" data-ce-tag="td" data-cell-header="department">Shoes</td><td class="stk-reset stk-table-cell" data-stk-css="stkKj3id" data-ce-tag="td" data-cell-header="sales">6</td><td class="stk-reset stk-table-cell" data-ce-tag="td" data-stk-css="stkDkvDz" data-cell-header="first_sale">6</td><td class="stk-reset stk-table-cell" data-stk-css="stkLdSYz" data-ce-tag="td" data-cell-header="last_sale">8</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkKw1tM" data-ce-tag="td" data-cell-header="id">6</td><td class="stk-reset stk-table-cell" data-stk-css="stkb0Q1y" data-ce-tag="td" data-cell-header="sale_date">2024-02-02</td><td class="stk-reset stk-table-cell" data-stk-css="stk9lhqy" data-ce-tag="td" data-cell-header="department">Shoes</td><td class="stk-reset stk-table-cell" data-stk-css="stkjMXkH" data-ce-tag="td" data-cell-header="sales">4</td><td class="stk-reset stk-table-cell" data-ce-tag="td" data-stk-css="stkSL7Pk" data-cell-header="first_sale">6</td><td class="stk-reset stk-table-cell" data-stk-css="stkh9nD3" data-ce-tag="td" data-cell-header="last_sale">8</td></tr><tr class="stk-reset stk-table-row"><td class="stk-reset stk-table-cell" data-stk-css="stkCt_og" data-ce-tag="td" data-cell-header="id">7</td><td class="stk-reset stk-table-cell" data-stk-css="stkBZ6Ek" data-ce-tag="td" data-cell-header="sale_date">2024-02-03</td><td class="stk-reset stk-table-cell" data-stk-css="stkVloqf" data-ce-tag="td" data-cell-header="department">Shoes</td><td class="stk-reset stk-table-cell" data-stk-css="stkgKAYb" data-ce-tag="td" data-cell-header="sales">8</td><td class="stk-reset stk-table-cell" data-ce-tag="td" data-stk-css="stkiY8hp" data-cell-header="first_sale">6</td><td class="stk-reset stk-table-cell" data-stk-css="stk2R1tQ" data-ce-tag="td" data-cell-header="last_sale">8</td></tr></tbody></table></div><div class="stk-grid__layout_reverse stk-grid valign-middle" data-stk-css="stkOBYZv" data-ce-tag="grid"><div data-col-width="4" class="stk-grid-col stk-grid-col_last valign-middle" data-ce-tag="grid-col" data-stk-css="" data-stk-css-m=""><figure class="stk-reset stk-image-figure" data-ce-tag="image-figure"><div class="stk-mask" data-ce-tag="mask"><img src="/upload/setka_images/13242125062024_32b3c193345357b98799ef493326c03d9b36174f.png" data-image-id="84337" data-image-name="rm5.png" class="stk-image stk-reset" width="372" height="200" loading="lazy"/></div></figure></div><div data-col-width="8" class="stk-grid-col valign-middle" data-ce-tag="grid-col"><p class="stk-reset stk-theme_26309__mb_05 stk-theme_26309__style_font_style-1629726727970" data-ce-tag="paragraph">Читайте также:</p><p class="stk-theme_26309__mb_15 stk-reset stk-theme_26309__style_font_style-1629786048064 stk-theme_26309__style_font_style-1629290372003 stk-theme_26309__color_26309_custom_color_1 article_incut" data-ce-tag="paragraph"><a href="https://skillbox.ru/media/code/sistema-upravleniya-bazami-dannykh-chto-eto-takoe-i-zachem-ona-nuzhna/" 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</style><style data-stk-css="stkvYsFl" class="" media="all">[data-stk-css="stkvYsFl"]:not(#stk):not(#stk):not(style){border: 1px solid grey; width: 20%}</style><style data-stk-css="stk9I9YF" class="" media="all">[data-stk-css="stk9I9YF"]:not(#stk):not(#stk):not(style){border: 1px solid grey; width: 20%}</style><style data-stk-css="stk6lVed" class="" media="all">[data-stk-css="stk6lVed"]:not(#stk):not(#stk):not(style){border: 1px solid grey; width: 20%}</style><style data-stk-css="stk6eiEx" class="" media="all">[data-stk-css="stk6eiEx"]:not(#stk):not(#stk):not(style){border: 1px solid grey; width: 20%}</style><div class="stk-footnote stk-footnote--hide" data-stk-show="mouseover" data-stk-footnote-body="fn_6-oh" data-ce-tag="footnote" style="display:none"><div class="stk-footnote__close"></div><div class="stk-footnote__body"><p class="stk-theme_26309__style_small_text stk-reset" data-ce-tag="paragraph">Агрегатные функции — функции, которые проводят вычисления на группе значений и 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\u0433\u043e\u0434\u0430 \u0442\u0430\u043a\u0436\u0435 \u0437\u0430\u043d\u0438\u043c\u0430\u043b\u0430\u0441\u044c \u0443\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0435\u043c \r\n\u043f\u0440\u043e\u0435\u043a\u0442\u0430\u043c\u0438 \u0432 \u043c\u043e\u0431\u0438\u043b\u044c\u043d\u043e\u0439 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0435.\r\n\r\n\u0422\u0430\u0431\u043b\u0438\u0446\u0430 \u0434\u043b\u044f \u043f\u0440\u0438\u043c\u0435\u0440\u043e\u0432\r\n\r\n\u0421\u043e\u0437\u0434\u0430\u0434\u0438\u043c \u0442\u0430\u0431\u043b\u0438\u0446\u0443 sport_sales, \u0441\u043e\u0434\u0435\u0440\u0436\u0430\u0449\u0443\u044e \u043f\u0440\u043e\u0434\u0430\u0436\u0438 \r\n\u043c\u0430\u0433\u0430\u0437\u0438\u043d\u0430 \u0441\u043f\u043e\u0440\u0442\u0438\u0432\u043d\u044b\u0445 \u0442\u043e\u0432\u0430\u0440\u043e\u0432 \u043f\u043e \u043e\u0442\u0434\u0435\u043b\u0430\u043c. \u0412\u043a\u043b\u044e\u0447\u0438\u043c \u0432 \u043d\u0435\u0451 \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0438\u0435 \u043f\u043e\u043b\u044f:\r\n\r\n- id \u2014 \u0443\u043d\u0438\u043a\u0430\u043b\u044c\u043d\u044b\u0439 \u0438\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0442\u043e\u0440 \u043a\u0430\u0436\u0434\u043e\u0439 \r\n\u0437\u0430\u043f\u0438\u0441\u0438;\r\n- sale_date \u2014 \u0434\u0430\u0442\u0430 \u043f\u0440\u043e\u0434\u0430\u0436 \u043f\u043e \u043a\u0430\u0436\u0434\u043e\u043c\u0443 \u043e\u0442\u0434\u0435\u043b\u0443;\r\n- department \u2014 \u043d\u0430\u0438\u043c\u0435\u043d\u043e\u0432\u0430\u043d\u0438\u0435 \u043e\u0442\u0434\u0435\u043b\u0430;\r\n- sales \u2014 \u043a\u043e\u043b\u0438\u0447\u0435\u0441\u0442\u0432\u043e \u043f\u0440\u043e\u0434\u0430\u0436 \u043f\u043e \u043a\u0430\u0436\u0434\u043e\u043c\u0443 \r\n\u043e\u0442\u0434\u0435\u043b\u0443 \u0437\u0430 \u0434\u0435\u043d\u044c.\r\n\r\n\u0422\u0430\u0431\u043b\u0438\u0446\u0443 \u043c\u043e\u0436\u043d\u043e \u0441\u043e\u0437\u0434\u0430\u0442\u044c \u0441 \u043f\u043e\u043c\u043e\u0449\u044c\u044e \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0435\u0433\u043e \r\n\u0437\u0430\u043f\u0440\u043e\u0441\u0430:\r\n\r\nCREATE TABLE IF NOT EXISTS sport_sales ( id integer primary key, sale_date \r\ndate, department varchar(50), sales integer );\r\n\r\n\u0410 \u0434\u043b\u044f \u0437\u0430\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u0442\u0430\u0431\u043b\u0438\u0446\u044b \u0434\u0430\u043d\u043d\u044b\u043c\u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u043c \r\n\u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0438\u0439 \u043a\u043e\u0434:\r\n\r\ninsert into sport_sales (id, sale_date, department, sales) values (1, 2024-02-01, \r\n'Shoes', 6), (2, 2024-02-01, Clothing', 5), (3, 2024-02-01, Equipment', 10), (4, 2024-02-02, Clothing', 6), (5, 2024-02-02, Clothing', 6), (5, 2024-02-02, Equipment', 4), (6, 2024-02-01, 'Shoes', 4), (7, 2024-02-03, 'Shoes', 8), (8, 2024-02-03, Equipment', 10), (9, 2024-02-01, Clothing', 4);\r\n\r\n\u0412 \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442\u0435 \u043f\u043e\u043b\u0443\u0447\u0438\u043c \u0432\u043e\u0442 \u0442\u0430\u043a\u0443\u044e \u0442\u0430\u0431\u043b\u0438\u0446\u0443 \r\n\u0431\u0430\u0437\u044b \u0434\u0430\u043d\u043d\u044b\u0445, \u0431\u0443\u0434\u0435\u043c \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u0435\u0451:\r\n\r\nid sale_date department sales \r\n1 2024-02-01 Shoes 6 \r\n2 2024-02-01 Clothing 5 \r\n3 2024-02-01 Equipment 10 \r\n4 2024-02-02 Clothing 6 \r\n5 2024-02-02 Equipment 4 \r\n6 2024-02-02 Shoes 4 \r\n7 2024-02-03 Shoes 8 \r\n8 2024-02-03 Equipment 10 \r\n9 2024-02-03 Clothing 4 \r\n\r\n\r\n\u0421\u0438\u043d\u0442\u0430\u043a\u0441\u0438\u0441 \u043e\u043a\u043e\u043d\u043d\u044b\u0445 \u0444\u0443\u043d\u043a\u0446\u0438\u0439\r\n\r\n\r\n\r\n?\ufe0f \u0422\u0435\u0445\u043d\u0438\u0447\u0435\u0441\u043a\u0438\u0435 \u0434\u0435\u0442\u0430\u043b\u0438\r\n\r\n\u0421\u0438\u043d\u0442\u0430\u043a\u0441\u0438\u0441 \u043e\u043a\u043e\u043d\u043d\u044b\u0445 \u0444\u0443\u043d\u043a\u0446\u0438\u0439 \u043c\u043e\u0436\u0435\u0442 \u0440\u0430\u0437\u043b\u0438\u0447\u0430\u0442\u044c\u0441\u044f \r\n\u0432 \u0440\u0430\u0437\u043d\u044b\u0445 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u044f\u0445 SQL. \u041d\u0435\u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u0444\u0443\u043d\u043a\u0446\u0438\u0438 \u043c\u043e\u0433\u0443\u0442 \u043d\u0430\u0437\u044b\u0432\u0430\u0442\u044c\u0441\u044f \u0438\u043d\u0430\u0447\u0435 \u0438\u043b\u0438 \u0438\u0445 \u043c\u043e\u0436\u0435\u0442 \u043d\u0435 \u0431\u044b\u0442\u044c \u0432\u043e\u0432\u0441\u0435. \u0417\u0430\u043f\u0440\u043e\u0441\u044b \u0432 \u044d\u0442\u043e\u0439 \u0441\u0442\u0430\u0442\u044c\u0435 \u043f\u043e\u043a\u0430\u0437\u0430\u043d\u044b \u043d\u0430 \u043f\u0440\u0438\u043c\u0435\u0440\u0435 PL\\SQL \u2014 \u0434\u0438\u0430\u043b\u0435\u043a\u0442\u0430, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u0442\u0441\u044f \u0432 \u0431\u0430\u0437\u0430\u0445 \u0434\u0430\u043d\u043d\u044b\u0445 \u043f\u043e\u0434 \u0443\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0435\u043c Oracle DB .\r\n\r\n\u0412 \u043e\u0431\u0449\u0435\u043c \u0432\u0438\u0434\u0435 \u0441\u0438\u043d\u0442\u0430\u043a\u0441\u0438\u0441 \u043e\u043a\u043e\u043d\u043d\u044b\u0445 \u0444\u0443\u043d\u043a\u0446\u0438\u0439 \r\n\u0432\u044b\u0433\u043b\u044f\u0434\u0438\u0442 \u0442\u0430\u043a:\r\n\r\n<window_function>(arguments) OVER ([Partitioning] [Ordering] [Frame]\r\n) \r\n\r\n\u0414\u0435\u0442\u0430\u043b\u044c\u043d\u043e \u0440\u0430\u0437\u0431\u0435\u0440\u0451\u043c \u0441\u0442\u0440\u0443\u043a\u0442\u0443\u0440\u0443:\r\n\r\n- <window_function_name> \u2014 \u0438\u043c\u044f \u043e\u043a\u043e\u043d\u043d\u043e\u0439 \u0444\u0443\u043d\u043a\u0446\u0438\u0438, \r\n\u043d\u0430\u043f\u0440\u0438\u043c\u0435\u0440 ROW_NUMBER(), RANK(), DENSE_RANK() \u0438 \u0434\u0440\u0443\u0433\u0438\u0435.\r\n- (arguments) \u2014 \u0430\u0440\u0433\u0443\u043c\u0435\u043d\u0442\u044b \u0444\u0443\u043d\u043a\u0446\u0438\u0438, \u043d\u0430\u043f\u0440\u0438\u043c\u0435\u0440 \r\n\u0438\u043c\u044f \u0441\u0442\u043e\u043b\u0431\u0446\u0430, \u043f\u043e \u043a\u043e\u0442\u043e\u0440\u043e\u043c\u0443 \u043f\u0440\u043e\u0438\u0441\u0445\u043e\u0434\u0438\u0442 \u0440\u0430\u0441\u0447\u0451\u0442.\r\n- OVER() \u2014 \u043a\u043b\u044e\u0447\u0435\u0432\u043e\u0435 \u0441\u043b\u043e\u0432\u043e, \u043a\u043e\u0442\u043e\u0440\u043e\u0435 \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u044f\u0435\u0442, \r\n\u043a\u0430\u043a \u043e\u043a\u043e\u043d\u043d\u0430\u044f \u0444\u0443\u043d\u043a\u0446\u0438\u044f \u0431\u0443\u0434\u0435\u0442 \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0442\u0441\u044f \u043a \u043d\u0430\u0431\u043e\u0440\u0443 \u0434\u0430\u043d\u043d\u044b\u0445.\r\n- [Partitioning] \u2014 \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u044f\u0435\u0442 \u043a\u0440\u0438\u0442\u0435\u0440\u0438\u0439, \u043f\u043e \u043a\u043e\u0442\u043e\u0440\u043e\u043c\u0443 \r\n\u0441\u0442\u0440\u043e\u043a\u0438 \u0434\u0435\u043b\u044f\u0442\u0441\u044f \u043d\u0430 \u043f\u043e\u0434\u0433\u0440\u0443\u043f\u043f\u044b. \u042d\u0442\u043e \u043d\u0435\u043e\u0431\u044f\u0437\u0430\u0442\u0435\u043b\u044c\u043d\u044b\u0439 \u043a\u043e\u043c\u043f\u043e\u043d\u0435\u043d\u0442.\r\n- [Ordering] \u2014 \u0443\u043a\u0430\u0437\u044b\u0432\u0430\u0435\u0442 \u043f\u043e\u0440\u044f\u0434\u043e\u043a \u0441\u0442\u0440\u043e\u043a \u0432 \u043a\u0430\u0436\u0434\u043e\u0439 \r\n\u043f\u043e\u0434\u0433\u0440\u0443\u043f\u043f\u0435, \u0447\u0442\u043e \u0432\u0430\u0436\u043d\u043e \u0434\u043b\u044f \u0442\u0430\u043a\u0438\u0445 \u0444\u0443\u043d\u043a\u0446\u0438\u0439, \u043a\u0430\u043a RANK(), ROW_NUMBER() \u0438 \u0434\u0440\u0443\u0433\u0438\u0445. \u042d\u0442\u043e\u0442 \u044d\u043b\u0435\u043c\u0435\u043d\u0442 \u0442\u043e\u0436\u0435 \u043d\u0435\u043e\u0431\u044f\u0437\u0430\u0442\u0435\u043b\u0435\u043d.\r\n- [Frame] \u2014 \u0437\u0430\u0434\u0430\u0451\u0442 \u00ab\u0444\u0440\u0435\u0439\u043c\u00bb \u0441\u0442\u0440\u043e\u043a \u043e\u0442\u043d\u043e\u0441\u0438\u0442\u0435\u043b\u044c\u043d\u043e \r\n\u0442\u0435\u043a\u0443\u0449\u0435\u0439. \u041a\u0430\u043a \u043f\u0440\u0430\u0432\u0438\u043b\u043e, \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u0442\u0441\u044f \u0441 \u043a\u043b\u044e\u0447\u0435\u0432\u044b\u043c\u0438 \u0441\u043b\u043e\u0432\u0430\u043c\u0438 ROWS \u0438\u043b\u0438 RANGE.\r\n\r\n\u0420\u0430\u0441\u0441\u043c\u043e\u0442\u0440\u0438\u043c \u043f\u043e\u0434\u0440\u043e\u0431\u043d\u0435\u0435 \u044d\u0442\u0438 \u043a\u043e\u043c\u043f\u043e\u043d\u0435\u043d\u0442\u044b.\r\n\r\n\r\n\r\n \r\n\r\n\r\n\u0427\u0438\u0442\u0430\u0439\u0442\u0435 \u0442\u0430\u043a\u0436\u0435:\r\n\r\n\u041a\u0430\u043a\u0438\u0435 \u0431\u0430\u0437\u044b \u0434\u0430\u043d\u043d\u044b\u0445 \u0441\u0443\u0449\u0435\u0441\u0442\u0432\u0443\u044e\u0442 \u0438 \u0434\u043b\u044f \u0447\u0435\u0433\u043e \r\n\u0438\u0445 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044e\u0442: SQL, NoSQL, OLAP PARTITION BY\r\n\r\n\u041f\u0430\u0440\u0430\u043c\u0435\u0442\u0440, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u0440\u0430\u0437\u0434\u0435\u043b\u0438\u0442\u044c \r\n\u0434\u0430\u043d\u043d\u044b\u0435 \u043d\u0430 \u0433\u0440\u0443\u043f\u043f\u044b, \u0432\u043d\u0443\u0442\u0440\u0438 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u0431\u0443\u0434\u0435\u0442 \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0442\u044c\u0441\u044f \u043e\u043a\u043e\u043d\u043d\u0430\u044f \u0444\u0443\u043d\u043a\u0446\u0438\u044f. PARTITION BY \u0434\u0435\u0439\u0441\u0442\u0432\u0443\u0435\u0442 \u0430\u043d\u0430\u043b\u043e\u0433\u0438\u0447\u043d\u043e GROUP BY \u0432 \u0430\u0433\u0440\u0435\u0433\u0430\u0442\u043d\u044b\u0445 \u0444\u0443\u043d\u043a\u0446\u0438\u044f\u0445, \u043d\u043e \u0432 \u043e\u043a\u043e\u043d\u043d\u044b\u0445 \u0444\u0443\u043d\u043a\u0446\u0438\u044f\u0445 \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442 \u0432\u043e\u0437\u0432\u0440\u0430\u0449\u0430\u0435\u0442\u0441\u044f \u0434\u043b\u044f \u043a\u0430\u0436\u0434\u043e\u0439 \u0441\u0442\u0440\u043e\u043a\u0438 \u0432\u0445\u043e\u0434\u043d\u044b\u0445 \u0434\u0430\u043d\u043d\u044b\u0445.\r\n\r\n\u041d\u0430\u043f\u0440\u0438\u043c\u0435\u0440, \u0440\u0430\u0441\u0441\u043c\u043e\u0442\u0440\u0438\u043c, \u043a\u0430\u043a \u0440\u0430\u0431\u043e\u0442\u0430\u0435\u0442 \u0437\u0430\u043f\u0440\u043e\u0441 \r\n\u0441 \u0433\u0440\u0443\u043f\u043f\u0438\u0440\u043e\u0432\u043a\u043e\u0439 GROUP BY, \u0441\u0447\u0438\u0442\u0430\u044e\u0449\u0438\u0439 \u0441\u0443\u043c\u043c\u0430\u0440\u043d\u044b\u0435 \u043f\u0440\u043e\u0434\u0430\u0436\u0438 \u0437\u0430 \u043f\u0435\u0440\u0438\u043e\u0434 \u043f\u043e \u043a\u0430\u0436\u0434\u043e\u043c\u0443 \u043e\u0442\u0434\u0435\u043b\u0443:\r\n\r\nSELECT department, sum(sales) AS sum_sales FROM sport_sales GROUP BY department \r\nORDER BY department;\r\n\r\n\u0412 \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442\u0435 \u043f\u043e\u043b\u0443\u0447\u0438\u043c:\r\n\r\ndepartment sum_sales \r\nClothing 15 \r\nEquipment 24 \r\nShoes 18 \r\n\r\n\r\n\u042d\u0442\u043e\u0442 \u0437\u0430\u043f\u0440\u043e\u0441 \u0432\u044b\u0432\u043e\u0434\u0438\u0442 \u0432 \u0441\u0442\u043e\u043b\u0431\u0446\u0435 sum_sales \u0441\u0443\u043c\u043c\u0443 \r\n\u043f\u0440\u043e\u0434\u0430\u0436 \u043f\u043e \u043a\u0430\u0436\u0434\u043e\u043c\u0443 \u043e\u0442\u0434\u0435\u043b\u0443.\r\n\r\n\u0422\u0435\u043f\u0435\u0440\u044c \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u043c \u043e\u043a\u043e\u043d\u043d\u0443\u044e \u0444\u0443\u043d\u043a\u0446\u0438\u044e:\r\n\r\nSELECT id, sale_date, department, sales, sum(sale) OVER(PARTITION BY department) \r\nAS sum_sales FROM sport_sales4 ORDER BY department, sale_date; \r\n\r\n\u0420\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442 \u0431\u0443\u0434\u0435\u0442 \u0442\u0430\u043a\u0438\u043c:\r\n\r\nid sale_date department sales sum_sales \r\n2 2024-02-01 Clothing 5 15 \r\n4 2024-02-02 Clothing 6 15 \r\n9 2024-02-03 Clothing 4 15 \r\n3 2024-02-01 Equipment 10 24 \r\n5 2024-02-02 Equipment 4 24 \r\n8 2024-02-03 Equipment 10 24 \r\n1 2024-02-01 Shoes 6 18 \r\n6 2024-02-02 Shoes 4 18 \r\n7 2024-02-03 Shoes 8 18 \r\n\r\n\r\n\u042d\u0442\u043e\u0442 \u0437\u0430\u043f\u0440\u043e\u0441 \u0432\u044b\u0432\u043e\u0434\u0438\u0442 \u043f\u0440\u043e\u0434\u0430\u0436\u0438 \u043a\u0430\u0436\u0434\u043e\u0433\u043e \u043e\u0442\u0434\u0435\u043b\u0430 \r\n\u0432 \u0441\u0442\u043e\u043b\u0431\u0446\u0435 sales \u0438 \u0441\u0443\u043c\u043c\u0430\u0440\u043d\u044b\u0435 \u043f\u0440\u043e\u0434\u0430\u0436\u0438 \u0432 \u0441\u0442\u043e\u043b\u0431\u0446\u0435 sum_sales. \u0412\u0441\u0435 \u0441\u0442\u0440\u043e\u043a\u0438 \u0438\u0437 \u0438\u0441\u0445\u043e\u0434\u043d\u043e\u0439 \u0442\u0430\u0431\u043b\u0438\u0446\u044b \u0441\u043e\u0445\u0440\u0430\u043d\u044f\u044e\u0442\u0441\u044f, \u043f\u0440\u0438\u0447\u0451\u043c \u043e\u043d\u0438 \u0441\u0433\u0440\u0443\u043f\u043f\u0438\u0440\u043e\u0432\u0430\u043d\u044b \u043f\u043e \u043e\u0442\u0434\u0435\u043b\u0430\u043c.\r\n\r\n\r\n\r\n \r\n\r\n\r\n\u0427\u0438\u0442\u0430\u0439\u0442\u0435 \u0442\u0430\u043a\u0436\u0435:\r\n\r\nSQL-\u0437\u0430\u043f\u0440\u043e\u0441\u044b: \u043e\u0441\u043d\u043e\u0432\u043d\u044b\u0435 \u043a\u043e\u043c\u0430\u043d\u0434\u044b \u0434\u043b\u044f \u0443\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u044f \r\n\u0431\u0430\u0437\u0430\u043c\u0438 \u0434\u0430\u043d\u043d\u044b\u0445 ORDER BY\r\n\r\n\u041a\u043b\u044e\u0447\u0435\u0432\u043e\u0435 \u0441\u043b\u043e\u0432\u043e ORDER BY \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u044f\u0435\u0442, \u043a\u0430\u043a \u0434\u0430\u043d\u043d\u044b\u0435 \r\n\u0431\u0443\u0434\u0443\u0442 \u0443\u043f\u043e\u0440\u044f\u0434\u043e\u0447\u0435\u043d\u044b \u043f\u0440\u0438 \u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0438\u0438 \u043e\u043a\u043e\u043d\u043d\u043e\u0439 \u0444\u0443\u043d\u043a\u0446\u0438\u0438.\r\n\r\n\u0414\u043b\u044f \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0435\u043d\u0438\u044f \u043f\u043e\u0440\u044f\u0434\u043a\u0430 \u0441\u0442\u0440\u043e\u043a \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044e\u0442\u0441\u044f \r\n\u043a\u043b\u044e\u0447\u0435\u0432\u044b\u0435 \u0441\u043b\u043e\u0432\u0430 ASC \u0438 DESC:\r\n\r\n- ASC \u2014 \u0441\u043e\u0440\u0442\u0438\u0440\u043e\u0432\u043a\u0430 \u043f\u043e \u0432\u043e\u0437\u0440\u0430\u0441\u0442\u0430\u043d\u0438\u044e. \u042d\u0442\u043e \r\n\u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e. \u0423\u043f\u043e\u0440\u044f\u0434\u043e\u0447\u0438\u0432\u0430\u043d\u0438\u0435 \u043e\u0442 \u043d\u0430\u0438\u043c\u0435\u043d\u044c\u0448\u0435\u0433\u043e \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u044f \u043a \u043d\u0430\u0438\u0431\u043e\u043b\u044c\u0448\u0435\u043c\u0443.\r\n- DESC \u2014 \u0441\u043e\u0440\u0442\u0438\u0440\u043e\u0432\u043a\u0430 \u043f\u043e \u0443\u0431\u044b\u0432\u0430\u043d\u0438\u044e. \u0423\u043f\u043e\u0440\u044f\u0434\u043e\u0447\u0438\u0432\u0430\u043d\u0438\u0435 \r\n\u043e\u0442 \u043d\u0430\u0438\u0431\u043e\u043b\u044c\u0448\u0435\u0433\u043e \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u044f \u043a \u043d\u0430\u0438\u043c\u0435\u043d\u044c\u0448\u0435\u043c\u0443.\r\n\r\nORDER BY \u043c\u043e\u0436\u0435\u0442 \u0432\u043a\u043b\u044e\u0447\u0430\u0442\u044c \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u043a\u043e\u043b\u043e\u043d\u043e\u043a. \r\n\u041d\u0430\u043f\u0440\u0438\u043c\u0435\u0440, ORDER BY sale_date ASC, sale DESC \u0441\u043d\u0430\u0447\u0430\u043b\u0430 \u0443\u043f\u043e\u0440\u044f\u0434\u043e\u0447\u0438\u0432\u0430\u0435\u0442 \u0434\u0430\u043d\u043d\u044b\u0435 \u043e\u0442\u0434\u0435\u043b\u043e\u0432 \u043f\u043e \u0434\u0430\u0442\u0430\u043c \u0432 \u043f\u043e\u0440\u044f\u0434\u043a\u0435 \u0432\u043e\u0437\u0440\u0430\u0441\u0442\u0430\u043d\u0438\u044f, \u0430 \u0437\u0430\u0442\u0435\u043c \u043f\u043e \u043f\u0440\u043e\u0434\u0430\u0436\u0430\u043c \u0432 \u043f\u043e\u0440\u044f\u0434\u043a\u0435 \u0443\u0431\u044b\u0432\u0430\u043d\u0438\u044f.\r\n\r\n\u0421\u043e\u0441\u0442\u0430\u0432\u0438\u043c \u0437\u0430\u043f\u0440\u043e\u0441 \u0441 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435\u043c \u0444\u0443\u043d\u043a\u0446\u0438\u0438 \r\nRANK(), \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u043f\u0440\u0438\u0441\u0432\u0430\u0438\u0432\u0430\u0435\u0442 \u0440\u0430\u043d\u0433 \u043a\u0430\u0436\u0434\u043e\u0439 \u0441\u0442\u0440\u043e\u043a\u0435 \u0432 \u0437\u0430\u0432\u0438\u0441\u0438\u043c\u043e\u0441\u0442\u0438 \u043e\u0442 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u044f \u0432 \u0441\u0442\u043e\u043b\u0431\u0446\u0435 sale. \u041e\u0442\u0434\u0435\u043b\u0443 \u0441 \u043d\u0430\u0438\u0431\u043e\u043b\u044c\u0448\u0438\u043c\u0438 \u043f\u0440\u043e\u0434\u0430\u0436\u0430\u043c\u0438 \u0437\u0430 \u0434\u0435\u043d\u044c \u043f\u0440\u0438\u0441\u0432\u0430\u0438\u0432\u0430\u0435\u0442\u0441\u044f \u0440\u0430\u043d\u0433 1, \u0441 \u043d\u0430\u0438\u043c\u0435\u043d\u044c\u0448\u0438\u043c\u0438 \u2014 \u0440\u0430\u043d\u0433 3. \u0417\u043d\u0430\u0447\u0435\u043d\u0438\u044f \u0441\u0442\u043e\u043b\u0431\u0446\u0430 sale_date \u0441\u0433\u0440\u0443\u043f\u043f\u0438\u0440\u0443\u0435\u043c \u043f\u043e \u0432\u043e\u0437\u0440\u0430\u0441\u0442\u0430\u043d\u0438\u044e, \u0430 sales \u2014 \u043f\u043e \u0443\u0431\u044b\u0432\u0430\u043d\u0438\u044e:\r\n\r\nSELECT id, sale_date, department, sales, RANK() OVER(PARTITION BY sale_date \r\nORDER BY sale_date ASC, sales DESC) AS rank FROM sport_sales;\r\n\r\n\u0412\u043e\u0442 \u043a\u0430\u043a\u0443\u044e \u0442\u0430\u0431\u043b\u0438\u0446\u0443 \u043f\u043e\u043b\u0443\u0447\u0438\u043c \u0432 \u0438\u0442\u043e\u0433\u0435:\r\n\r\nid sale_date department sales rank \r\n3 2024-02-01 Equipment 10 1 \r\n1 2024-02-01 Shoes 6 2 \r\n2 2024-02-01 Clothing 5 3 \r\n4 2024-02-02 Clothing 6 1 \r\n5 2024-02-02 Equipment 4 2 \r\n6 2024-02-02 Shoes 4 2 \r\n8 2024-02-03 Equipment 10 1 \r\n7 2024-02-03 Shoes 8 2 \r\n9 2024-02-03 Clothing 4 3 \r\nROWS \u0438\u043b\u0438 RANGE\r\n\r\n\u041a\u043b\u044e\u0447\u0435\u0432\u044b\u0435 \u0441\u043b\u043e\u0432\u0430 ROWS \u0438 RANGE \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u044f\u044e\u0442, \u043a\u0430\u043a\u0438\u0435 \r\n\u0441\u0442\u0440\u043e\u043a\u0438 \u043e\u043a\u043d\u0430 \u0431\u0443\u0434\u0443\u0442 \u0443\u0447\u0438\u0442\u044b\u0432\u0430\u0442\u044c\u0441\u044f \u043f\u0440\u0438 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0438 \u0440\u0430\u0441\u0447\u0451\u0442\u043e\u0432. \u041e\u043d\u0438 \u0443\u0441\u0442\u0430\u043d\u0430\u0432\u043b\u0438\u0432\u0430\u044e\u0442 \u00ab\u0444\u0440\u0435\u0439\u043c\u00bb \u043e\u043a\u043d\u0430 \u2014 \u043d\u0430\u0431\u043e\u0440 \u0441\u0442\u0440\u043e\u043a \u043e\u0442\u043d\u043e\u0441\u0438\u0442\u0435\u043b\u044c\u043d\u043e \u0442\u0435\u043a\u0443\u0449\u0435\u0439 \u0441\u0442\u0440\u043e\u043a\u0438, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u0431\u0443\u0434\u0435\u0442 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c\u0441\u044f \u0434\u043b\u044f \u0432\u044b\u0447\u0438\u0441\u043b\u0435\u043d\u0438\u0439.\r\n\r\nROWS \u0437\u0430\u0434\u0430\u0451\u0442 \u0433\u0440\u0430\u043d\u0438\u0446\u044b \u043e\u043a\u043d\u0430 \u0432 \u043f\u0440\u0435\u0434\u0435\u043b\u0430\u0445 \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u043e\u0433\u043e \r\n\u043a\u043e\u043b\u0438\u0447\u0435\u0441\u0442\u0432\u0430 \u0441\u0442\u0440\u043e\u043a \u0434\u043e \u0438\u043b\u0438 \u043f\u043e\u0441\u043b\u0435 \u0442\u0435\u043a\u0443\u0449\u0435\u0439 \u0441\u0442\u0440\u043e\u043a\u0438. \u041d\u0430\u043f\u0440\u0438\u043c\u0435\u0440, ROWS BETWEEN 1 PRECEDING AND 1 FOLLOWING \u0443\u043a\u0430\u0437\u044b\u0432\u0430\u0435\u0442, \u0447\u0442\u043e \u043e\u043a\u043d\u043e \u0432\u043a\u043b\u044e\u0447\u0430\u0435\u0442 \u0441\u0442\u0440\u043e\u043a\u0443 \u043f\u0435\u0440\u0435\u0434 \u0442\u0435\u043a\u0443\u0449\u0435\u0439, \u0442\u0435\u043a\u0443\u0449\u0443\u044e \u0438 \u0441\u0442\u0440\u043e\u043a\u0443 \u043f\u043e\u0441\u043b\u0435. \u041d\u0430 \u0438\u0445 \u043e\u0441\u043d\u043e\u0432\u0430\u043d\u0438\u0438 \u0431\u0443\u0434\u0435\u0442 \u0432\u044b\u0447\u0438\u0441\u043b\u044f\u0442\u044c\u0441\u044f \u0444\u0443\u043d\u043a\u0446\u0438\u044f.\r\n\r\n\u041d\u0430\u043f\u0438\u0448\u0435\u043c \u0437\u0430\u043f\u0440\u043e\u0441, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u0441\u0443\u043c\u043c\u0438\u0440\u0443\u0435\u0442 \u043f\u0440\u043e\u0434\u0430\u0436\u0438 \r\n\u0432 \u0442\u0435\u043a\u0443\u0449\u0435\u0439, \u043f\u0440\u0435\u0434\u044b\u0434\u0443\u0449\u0435\u0439 \u0438 \u043f\u043e\u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0435\u0439 \u0441\u0442\u0440\u043e\u043a\u0430\u0445 \u0438 \u0440\u0430\u0437\u043c\u0435\u0449\u0430\u0435\u0442 \u043f\u043e\u043b\u0443\u0447\u0435\u043d\u043d\u044b\u0435 \u0441\u0443\u043c\u043c\u044b \u0432 \u0441\u0442\u043e\u043b\u0431\u0446\u0435 sum_sales:\r\n\r\nSELECT id, sale_date, department, sales, SUM(sale) OVER (ROWS BETWEEN 1 \r\nPRECEDING AND 1 FOLLOWING) AS sum_sales FROM sport_sales;\r\n\r\n\u0412 \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442\u0435 \u043f\u043e\u043b\u0443\u0447\u0438\u043c:\r\n\r\nid sale_date department sales sum_sales \r\n1 2024-02-01 Shoes 6 11 \r\n2 2024-02-01 Clothing 5 21 \r\n3 2024-02-01 Equipment 10 21 \r\n4 2024-02-02 Clothing 6 20 \r\n5 2024-02-02 Equipment 4 14 \r\n6 2024-02-02 Shoes 4 16 \r\n7 2024-02-03 Shoes 8 22 \r\n8 2024-02-03 Equipment 10 22 \r\n9 2024-02-03 Clothing 4 14 \r\n\r\n\r\n\u0412 \u0442\u0430\u0431\u043b\u0438\u0446\u0435 \u0432\u044b\u0448\u0435 \u0434\u0430\u043d\u043d\u044b\u0435 \u0441\u0433\u0440\u0443\u043f\u043f\u0438\u0440\u043e\u0432\u0430\u043d\u044b \r\n\u043f\u043e \u0434\u0430\u0442\u0430\u043c, \u0438 \u0432 \u0441\u0442\u043e\u043b\u0431\u0446\u0435 sum_sales \u0441\u0447\u0438\u0442\u0430\u044e\u0442\u0441\u044f \u0442\u0430\u043a:\r\n\r\n- \u041a\u043e\u0433\u0434\u0430 \u0442\u0435\u043a\u0443\u0449\u0430\u044f \u2014 \u043f\u0435\u0440\u0432\u0430\u044f \u0441\u0442\u0440\u043e\u043a\u0430, \u0441\u0443\u043c\u043c\u0438\u0440\u0443\u044e\u0442\u0441\u044f \r\n\u043f\u0440\u043e\u0434\u0430\u0436\u0438 \u0438\u0437 \u043f\u0435\u0440\u0432\u043e\u0439 \u0438 \u0432\u0442\u043e\u0440\u043e\u0439 \u0441\u0442\u0440\u043e\u043a\u0438.\r\n- \u041a\u043e\u0433\u0434\u0430 \u0442\u0435\u043a\u0443\u0449\u0430\u044f \u2014 \u0432\u0442\u043e\u0440\u0430\u044f \u0441\u0442\u0440\u043e\u043a\u0430, \u0441\u0443\u043c\u043c\u0438\u0440\u0443\u044e\u0442\u0441\u044f \r\n\u043f\u0440\u043e\u0434\u0430\u0436\u0438 \u0438\u0437 \u043f\u0435\u0440\u0432\u043e\u0439, \u0432\u0442\u043e\u0440\u043e\u0439 \u0438 \u0442\u0440\u0435\u0442\u044c\u0435\u0439 \u0441\u0442\u0440\u043e\u043a\u0438 \u0438 \u0442\u0430\u043a \u0434\u0430\u043b\u0435\u0435.\r\n\r\nRANGE \u0443\u0441\u0442\u0430\u043d\u0430\u0432\u043b\u0438\u0432\u0430\u0435\u0442 \u0433\u0440\u0430\u043d\u0438\u0446\u044b \u043e\u043a\u043d\u0430 \u043d\u0430 \u043e\u0441\u043d\u043e\u0432\u0435 \r\n\u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0439 \u0437\u0430\u0434\u0430\u043d\u043d\u043e\u0433\u043e \u0441\u0442\u043e\u043b\u0431\u0446\u0430, \u0430 \u043d\u0435 \u043d\u0430 \u0444\u0438\u0437\u0438\u0447\u0435\u0441\u043a\u043e\u043c \u0440\u0430\u0441\u043f\u043e\u043b\u043e\u0436\u0435\u043d\u0438\u0438 \u0441\u0442\u0440\u043e\u043a, \u043a\u0430\u043a \u044d\u0442\u043e \u0434\u0435\u043b\u0430\u0435\u0442 ROWS. \u041e\u043d \u0433\u0440\u0443\u043f\u043f\u0438\u0440\u0443\u0435\u0442 \u0432\u043c\u0435\u0441\u0442\u0435 \u0441\u0442\u0440\u043e\u043a\u0438 \u0441 \u043e\u0434\u0438\u043d\u0430\u043a\u043e\u0432\u044b\u043c\u0438 \u0438\u043b\u0438 \u0431\u043b\u0438\u0437\u043a\u0438\u043c\u0438 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u044f\u043c\u0438 \u0432 \u0443\u043a\u0430\u0437\u0430\u043d\u043d\u043e\u043c \u0441\u0442\u043e\u043b\u0431\u0446\u0435 \u0441\u043e\u0440\u0442\u0438\u0440\u043e\u0432\u043a\u0438.\r\n\r\n\u0422\u043e \u0435\u0441\u0442\u044c, \u043a\u043e\u0433\u0434\u0430 \u0432\u044b \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u0442\u0435 RANGE \u0432\u043c\u0435\u0441\u0442\u0435 \r\n\u0441 ORDER BY, SQL \u043e\u0431\u0440\u0430\u0431\u0430\u0442\u044b\u0432\u0430\u0435\u0442 \u043e\u043a\u043d\u043e \u0434\u043b\u044f \u043a\u0430\u0436\u0434\u043e\u0439 \u0441\u0442\u0440\u043e\u043a\u0438, \u0432\u043a\u043b\u044e\u0447\u0430\u044f \u0432 \u043d\u0435\u0433\u043e \u0432\u0441\u0451 \u0441 \u0441\u043e\u043e\u0442\u0432\u0435\u0442\u0441\u0442\u0432\u0443\u044e\u0449\u0438\u043c\u0438 \u0438\u043b\u0438 \u0441\u043e\u043f\u043e\u0441\u0442\u0430\u0432\u0438\u043c\u044b\u043c\u0438 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u044f\u043c\u0438 \u0441\u0442\u043e\u043b\u0431\u0446\u0430, \u0443\u043a\u0430\u0437\u0430\u043d\u043d\u043e\u0433\u043e \u0432 ORDER BY. \u042d\u0442\u043e \u0437\u043d\u0430\u0447\u0438\u0442, \u0447\u0442\u043e, \u0435\u0441\u043b\u0438 \u0435\u0441\u0442\u044c \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u0441\u0442\u0440\u043e\u043a \u0441 \u043e\u0434\u0438\u043d\u0430\u043a\u043e\u0432\u044b\u043c\u0438 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u044f\u043c\u0438 \u0432 \u0441\u043e\u0440\u0442\u0438\u0440\u0443\u0435\u043c\u043e\u043c \u0441\u0442\u043e\u043b\u0431\u0446\u0435 (\u043d\u0430\u043f\u0440\u0438\u043c\u0435\u0440, \u043e\u0434\u0438\u043d\u0430\u043a\u043e\u0432\u044b\u0435 \u0434\u0430\u0442\u044b \u0438\u043b\u0438 \u043e\u0442\u0434\u0435\u043b\u044b), \u043e\u043d\u0438 \u0432\u0441\u0435 \u0431\u0443\u0434\u0443\u0442 \u0432\u043a\u043b\u044e\u0447\u0435\u043d\u044b \u0432 \u043e\u043a\u043d\u043e.\r\n\r\n\r\n\r\n \r\n\r\n\r\n\u0427\u0438\u0442\u0430\u0439\u0442\u0435 \u0442\u0430\u043a\u0436\u0435:\r\n\r\n\u0427\u0442\u043e \u0442\u0430\u043a\u043e\u0435 SQL: \u043a\u0430\u043a \u0443\u0441\u0442\u0440\u043e\u0435\u043d, \u0437\u0430\u0447\u0435\u043c \u043d\u0443\u0436\u0435\u043d \u0438 \u043a\u0430\u043a \r\n\u0441 \u043d\u0438\u043c \u0440\u0430\u0431\u043e\u0442\u0430\u0442\u044c \r\n\r\n\u041d\u0430\u043f\u0440\u0438\u043c\u0435\u0440, \u0440\u0430\u0441\u0441\u0447\u0438\u0442\u0430\u0435\u043c \u043a\u0443\u043c\u0443\u043b\u044f\u0442\u0438\u0432\u043d\u0443\u044e (\u043d\u0430\u043a\u0430\u043f\u043b\u0438\u0432\u0430\u044e\u0449\u0443\u044e\u0441\u044f) \r\n\u0441\u0443\u043c\u043c\u0443 \u043f\u0440\u043e\u0434\u0430\u0436 \u043f\u043e \u0434\u0430\u0442\u0430\u043c. \u0414\u043b\u044f \u044d\u0442\u043e\u0433\u043e \u043d\u0430\u043f\u0438\u0448\u0435\u043c \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0438\u0439 \u0437\u0430\u043f\u0440\u043e\u0441:\r\n\r\nSELECT id, sale_date, department, sales, SUM(sale) OVER ( ORDER BY sale_date \r\nRANGE BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW ) AS cumulative_sales FROM sport_sales;\r\n\r\n\u0412 \u044d\u0442\u043e\u043c \u043f\u0440\u0438\u043c\u0435\u0440\u0435 \u0434\u043b\u044f \u043a\u0430\u0436\u0434\u043e\u0439 \u0434\u0430\u0442\u044b \u0431\u0443\u0434\u0443\u0442 \r\n\u0441\u0443\u043c\u043c\u0438\u0440\u043e\u0432\u0430\u0442\u044c\u0441\u044f \u0432\u0441\u0435 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u044f sale \u043d\u0430\u0447\u0438\u043d\u0430\u044f \u043e\u0442 \u0441\u0430\u043c\u043e\u0439 \u043f\u0435\u0440\u0432\u043e\u0439 \u0437\u0430\u043f\u0438\u0441\u0438 \u0434\u043e \u0442\u0435\u043a\u0443\u0449\u0435\u0439 \u0434\u0430\u0442\u044b, \u0432\u043a\u043b\u044e\u0447\u0430\u044f \u0432\u0441\u0435 \u0441\u0442\u0440\u043e\u043a\u0438 \u0441 \u0434\u0430\u0442\u0430\u043c\u0438, \u0440\u0430\u0432\u043d\u044b\u043c\u0438 \u0434\u0430\u0442\u0435 \u0442\u0435\u043a\u0443\u0449\u0435\u0439.\r\n\r\n\u0412 \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442\u0435 \u043f\u043e\u043b\u0443\u0447\u0438\u043c:\r\n\r\nid sale_date department sales cumulative_sales \r\n1 2024-02-01 Shoes 6 21 \r\n2 2024-02-01 Clothing 5 21 \r\n3 2024-02-01 Equipment 10 21 \r\n4 2024-02-02 Clothing 6 35 \r\n5 2024-02-02 Equipment 4 35 \r\n6 2024-02-02 Shoes 4 35 \r\n7 2024-02-03 Shoes 8 57 \r\n8 2024-02-03 Equipment 10 57 \r\n9 2024-02-03 Clothing 4 57 \r\n\r\n\r\nRANGE \u043c\u043e\u0436\u0435\u0442 \u0431\u044b\u0442\u044c \u043f\u043e\u043b\u0435\u0437\u0435\u043d, \u043a\u043e\u0433\u0434\u0430 \u043d\u0443\u0436\u043d\u043e \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u044c \r\n\u0432\u044b\u0447\u0438\u0441\u043b\u0435\u043d\u0438\u044f \u043d\u0430 \u0433\u0440\u0443\u043f\u043f\u0430\u0445 \u0434\u0430\u043d\u043d\u044b\u0445, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u043b\u043e\u0433\u0438\u0447\u0435\u0441\u043a\u0438 \u0441\u0432\u044f\u0437\u0430\u043d\u044b (\u043d\u0430\u043f\u0440\u0438\u043c\u0435\u0440, \u0437\u0430\u043f\u0438\u0441\u0438 \u0441 \u0442\u0435\u043c\u0438 \u0436\u0435 \u0434\u0430\u0442\u0430\u043c\u0438 \u0438\u043b\u0438 \u0431\u043b\u0438\u0437\u043a\u0438\u043c\u0438 \u0446\u0435\u043d\u0430\u043c\u0438).\r\n\r\n\u041a\u043b\u0430\u0441\u0441\u044b \u043e\u043a\u043e\u043d\u043d\u044b\u0445 \u0444\u0443\u043d\u043a\u0446\u0438\u0439\r\n\r\n\u0412 SQL \u0435\u0441\u0442\u044c \u043c\u043d\u043e\u0436\u0435\u0441\u0442\u0432\u043e \u043e\u043a\u043e\u043d\u043d\u044b\u0445 \u0444\u0443\u043d\u043a\u0446\u0438\u0439, \r\n\u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u0443\u043f\u0440\u043e\u0449\u0430\u044e\u0442 \u0440\u0430\u0431\u043e\u0442\u0443 \u0441 \u0434\u0430\u043d\u043d\u044b\u043c\u0438. \u0421 \u0438\u0445 \u043f\u043e\u043c\u043e\u0449\u044c\u044e \u043c\u043e\u0436\u043d\u043e \u0431\u044b\u0441\u0442\u0440\u043e \u043f\u0440\u043e\u0432\u043e\u0434\u0438\u0442\u044c \u0441\u043b\u043e\u0436\u043d\u044b\u0435 \u0432\u044b\u0447\u0438\u0441\u043b\u0435\u043d\u0438\u044f \u043f\u043e \u0433\u0440\u0443\u043f\u043f\u0430\u043c \u0441\u0442\u0440\u043e\u043a, \u0441\u0432\u044f\u0437\u0430\u043d\u043d\u044b\u0445 \u0441 \u0442\u0435\u043a\u0443\u0449\u0435\u0439. \u041e\u0441\u043d\u043e\u0432\u043d\u044b\u0435 \u043e\u043a\u043e\u043d\u043d\u044b\u0435 \u0444\u0443\u043d\u043a\u0446\u0438\u0438 \u043c\u043e\u0436\u043d\u043e \u0440\u0430\u0437\u0434\u0435\u043b\u0438\u0442\u044c \u043d\u0430 \u0442\u0440\u0438 \u0431\u043e\u043b\u044c\u0448\u0438\u0435 \u0433\u0440\u0443\u043f\u043f\u044b.\r\n----------------------\r\n\u0410\u0433\u0440\u0435\u0433\u0430\u0442\u043d\u044b\u0435 \u0444\u0443\u043d\u043a\u0446\u0438\u0438\r\n\r\n\u0410\u0433\u0440\u0435\u0433\u0430\u0442\u043d\u044b\u0435 \u0444\u0443\u043d\u043a\u0446\u0438\u0438 \u2014 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0442 \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u0442\u044c \r\n\u0441\u0443\u043c\u043c\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0435, \u043f\u043e\u0434\u0441\u0447\u0451\u0442, \u043d\u0430\u0445\u043e\u0436\u0434\u0435\u043d\u0438\u0435 \u043c\u0430\u043a\u0441\u0438\u043c\u0443\u043c\u043e\u0432 \u0438 \u043c\u0438\u043d\u0438\u043c\u0443\u043c\u043e\u0432 \u0438 \u0441\u0440\u0435\u0434\u043d\u0438\u0445 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0439. \u041e\u043d\u0438 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u044f\u0442 \u0432\u044b\u0447\u0438\u0441\u043b\u0435\u043d\u0438\u044f \u043d\u0430\u0434 \u043d\u0430\u0431\u043e\u0440\u043e\u043c \u0441\u0442\u0440\u043e\u043a \u0432 \u043e\u043a\u043d\u0435 \u0438 \u0432\u043e\u0437\u0432\u0440\u0430\u0449\u0430\u044e\u0442 \u043e\u0434\u043d\u043e \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0438\u0440\u0443\u044e\u0449\u0435\u0435 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435:\r\n\r\n- SUM(column_name) \u2014 \u0432\u043e\u0437\u0432\u0440\u0430\u0449\u0430\u0435\u0442 \u0441\u0443\u043c\u043c\u0443 \u0432\u044b\u0431\u0440\u0430\u043d\u043d\u044b\u0445 \r\n\u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0439;\r\n- AVG(column_name) \u2014 \u0432\u044b\u0447\u0438\u0441\u043b\u044f\u0435\u0442 \u0441\u0440\u0435\u0434\u043d\u0435\u0435 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435;\r\n- MAX(column_name) \u0438 MIN(column_name) \u2014 \u0432\u043e\u0437\u0432\u0440\u0430\u0449\u0430\u044e\u0442 \r\n\u043c\u0430\u043a\u0441\u0438\u043c\u0430\u043b\u044c\u043d\u043e\u0435 \u0438 \u043c\u0438\u043d\u0438\u043c\u0430\u043b\u044c\u043d\u043e\u0435 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 \u0441\u043e\u043e\u0442\u0432\u0435\u0442\u0441\u0442\u0432\u0435\u043d\u043d\u043e;\r\n- COUNT(column_name) \u2014 \u043d\u0430\u0445\u043e\u0434\u0438\u0442 \u043a\u043e\u043b\u0438\u0447\u0435\u0441\u0442\u0432\u043e \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0439.\r\n\r\n\u0412 \u043a\u0430\u0447\u0435\u0441\u0442\u0432\u0435 \u043f\u0440\u0438\u043c\u0435\u0440\u0430 \u043f\u0440\u0438\u043c\u0435\u043d\u0438\u043c \u0430\u0433\u0440\u0435\u0433\u0430\u0442\u043d\u044b\u0435 \r\n\u0444\u0443\u043d\u043a\u0446\u0438\u0438 \u043a \u043f\u0440\u043e\u0434\u0430\u0436\u0430\u043c \u0432 \u043e\u0442\u0434\u0435\u043b\u0430\u0445 \u0434\u043b\u044f \u043a\u0430\u0436\u0434\u043e\u0439 \u0434\u0430\u0442\u044b \u0442\u0430\u043a, \u0447\u0442\u043e\u0431\u044b \u043a\u0430\u0436\u0434\u0430\u044f \u0441\u0442\u0440\u043e\u043a\u0430 \u0432 \u043e\u043a\u043d\u0435 \u0441\u043e\u0445\u0440\u0430\u043d\u0438\u043b\u0430 \u0438\u0441\u0445\u043e\u0434\u043d\u044b\u0435 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u044f:\r\n\r\nSELECT id, sale_date, department, sales, AVG(sales) OVER (PARTITION BY \r\nsale_date) as avg_s, SUM(sales) OVER (PARTITION BY sale_date) as sum_s, MAX(sales)OVER (PARTITION BY sale_date) as max_s, MIN(sales)OVER (PARTITION BY sale_date) as min_s, COUNT(sales) OVER (PARTITION BY sale_date) as count_s FROM sport_sales; \r\n\r\n\u0412 \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442\u0435 \u043f\u043e\u043b\u0443\u0447\u0438\u043c \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0443\u044e \u0442\u0430\u0431\u043b\u0438\u0446\u0443:\r\n\r\nid sale_\r\ndate department sale avg_s sum_s max_s min_s count_s \r\n \r\n1 2024-02-01 Shoes 6 7.0 21 10 5 3 \r\n2 2024-02-01 Clothing 5 7.0 21 10 5 3 \r\n3 2024-02-01 Equipment 10 7.0 21 10 5 3 \r\n4 2024-02-02 Clothing 6 4.7 14 6 4 3 \r\n5 2024-02-02 Equipment 4 4.7 14 6 4 3 \r\n6 2024-02-02 Shoes 4 4.7 14 6 4 3 \r\n7 2024-02-03 Shoes 8 7.3 22 10 4 3 \r\n8 2024-02-03 Equipment 10 7.3 22 10 4 3 \r\n9 2024-02-03 Clothing 4 7.3 22 10 4 3 \r\n\r\n\r\n\u0412\u0430\u0436\u043d\u043e \u043e\u0442\u043c\u0435\u0442\u0438\u0442\u044c, \u0447\u0442\u043e \u0430\u0433\u0440\u0435\u0433\u0430\u0442\u043d\u044b\u0435 \u0444\u0443\u043d\u043a\u0446\u0438\u0438 \r\n\u0447\u0443\u0432\u0441\u0442\u0432\u0438\u0442\u0435\u043b\u044c\u043d\u044b \u043a NULL. \u041a \u043f\u0440\u0438\u043c\u0435\u0440\u0443, AVG() \u0438 SUM() \u0438\u0433\u043d\u043e\u0440\u0438\u0440\u0443\u044e\u0442 \u0442\u0430\u043a\u0438\u0435 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u044f, \u0430 COUNT() \u2014 \u0441\u0447\u0438\u0442\u0430\u0435\u0442 \u0432\u0441\u0435 \u0441\u0442\u0440\u043e\u043a\u0438, \u0434\u0430\u0436\u0435 \u0441 NULL.\r\n\r\n\r\n\r\n \r\n\r\n\r\n\u0427\u0438\u0442\u0430\u0439\u0442\u0435 \u0442\u0430\u043a\u0436\u0435:\r\n\r\nNULL, \u043d\u043e\u043b\u044c \u0438 undefined \u0432 SQL: \u0447\u0435\u043c \u0440\u0430\u0437\u043b\u0438\u0447\u0430\u044e\u0442\u0441\u044f \r\n\u0438 \u043a\u0430\u043a \u0441 \u043d\u0438\u043c\u0438 \u0440\u0430\u0431\u043e\u0442\u0430\u0442\u044c \u0424\u0443\u043d\u043a\u0446\u0438\u0438 \u0440\u0430\u043d\u0436\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f\r\n\r\n\u0424\u0443\u043d\u043a\u0446\u0438\u0438 \u0440\u0430\u043d\u0436\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u043f\u0440\u0435\u0434\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u044e\u0442 \u0441\u043f\u043e\u0441\u043e\u0431\u044b \r\n\u043e\u0446\u0435\u043d\u043a\u0438 \u043f\u043e\u0437\u0438\u0446\u0438\u0438 \u043a\u0430\u0436\u0434\u043e\u0439 \u0441\u0442\u0440\u043e\u043a\u0438 \u0441\u0440\u0435\u0434\u0438 \u0441\u0432\u043e\u0438\u0445 \u0441\u043e\u0441\u0435\u0434\u0435\u0439 \u0432 \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u043e\u043c \u043f\u043e\u0440\u044f\u0434\u043a\u0435. \u041e\u043d\u0438 \u043f\u043e\u043b\u0435\u0437\u043d\u044b, \u043a\u043e\u0433\u0434\u0430 \u043d\u0435\u043e\u0431\u0445\u043e\u0434\u0438\u043c\u043e \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0438\u0442\u044c \u0440\u0430\u043d\u0433\u0438 \u0432 \u043d\u0430\u0431\u043e\u0440\u0435 \u0434\u0430\u043d\u043d\u044b\u0445.\r\n\r\n\u041e\u0441\u043d\u043e\u0432\u043d\u044b\u0435 \u0444\u0443\u043d\u043a\u0446\u0438\u0438 \u0440\u0430\u043d\u0436\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f:\r\n\r\n\u0424\u0443\u043d\u043a\u0446\u0438\u044f RANK(). \u041f\u0440\u0438\u0441\u0432\u0430\u0438\u0432\u0430\u0435\u0442 \u0440\u0430\u043d\u0433 \u043a\u0430\u0436\u0434\u043e\u0439 \u0441\u0442\u0440\u043e\u043a\u0435 \r\n\u0432 \u0440\u0430\u0437\u0434\u0435\u043b\u0435 \u043e\u043a\u043d\u0430. \u0415\u0441\u043b\u0438 \u0441\u0442\u0440\u043e\u043a\u0438 \u043e\u0434\u0438\u043d\u0430\u043a\u043e\u0432\u044b, \u043e\u043d\u0438 \u043f\u043e\u043b\u0443\u0447\u0430\u044e\u0442 \u043e\u0434\u0438\u043d\u0430\u043a\u043e\u0432\u044b\u0439 \u0440\u0430\u043d\u0433, \u043d\u043e \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0438\u0439 \u0440\u0430\u043d\u0433 \u0431\u0443\u0434\u0435\u0442 \u0443\u0432\u0435\u043b\u0438\u0447\u0435\u043d \u043d\u0430 \u043a\u043e\u043b\u0438\u0447\u0435\u0441\u0442\u0432\u043e \u0441\u0442\u0440\u043e\u043a \u0441 \u043e\u0434\u0438\u043d\u0430\u043a\u043e\u0432\u044b\u043c \u0440\u0430\u043d\u0433\u043e\u043c.\r\n\r\n\u0412 \u043f\u0440\u0438\u043c\u0435\u0440\u0435 \u043d\u0438\u0436\u0435 SQL-\u0437\u0430\u043f\u0440\u043e\u0441 \u043f\u0440\u0438\u0441\u0432\u0430\u0438\u0432\u0430\u0435\u0442 \r\n\u0441\u0442\u0440\u043e\u043a\u0430\u043c \u0440\u0430\u043d\u0433\u0438 \u0432 \u043f\u043e\u0440\u044f\u0434\u043a\u0435 \u0432\u043e\u0437\u0440\u0430\u0441\u0442\u0430\u043d\u0438\u044f \u0447\u0438\u0441\u043b\u0430 \u043f\u0440\u043e\u0434\u0430\u0436. \u0415\u0441\u043b\u0438 \u043a\u043e\u043b\u0438\u0447\u0435\u0441\u0442\u0432\u043e \u043f\u0440\u043e\u0434\u0430\u0436 \u043e\u0434\u0438\u043d\u0430\u043a\u043e\u0432\u043e\u0435 (id 5 \u0438 6), \u0442\u043e \u0431\u0443\u0434\u0435\u0442 \u043f\u0440\u0438\u0441\u0432\u043e\u0435\u043d \u0440\u0430\u043d\u0433 1, \u0430 \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0435\u0439 \u043f\u043e \u043f\u043e\u0440\u044f\u0434\u043a\u0443 \u0441\u0442\u0440\u043e\u043a\u0435 (id 4) \u2014 \u0440\u0430\u043d\u0433 3:\r\n\r\nSELECT id, sale_date, department, sales, RANK() OVER (PARTITION BY sale_date \r\nORDER BY sales) AS rank_s FROM sport_sales;\r\n\r\n\u0422\u0430\u043a \u0432\u044b\u0433\u043b\u044f\u0434\u0438\u0442 \u0442\u0430\u0431\u043b\u0438\u0446\u0430 \u0441 \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442\u043e\u043c \u0437\u0430\u043f\u0440\u043e\u0441\u0430:\r\n\r\nid sale_date department sales rank_s \r\n2 2024-02-01 Clothing 5 1 \r\n1 2024-02-01 Shoes 6 2 \r\n3 2024-02-01 Equipment 10 3 \r\n5 2024-02-02 Equipment 4 1 \r\n6 2024-02-02 Shoes 4 1 \r\n4 2024-02-02 Clothing 6 3 \r\n9 2024-02-03 Clothing 4 1 \r\n7 2024-02-03 Shoes 8 2 \r\n8 2024-02-03 Equipment 10 3 \r\n\r\n\r\n\u0424\u0443\u043d\u043a\u0446\u0438\u044f DENSE_RANK(). \u041f\u043e\u0445\u043e\u0436\u0430 \u043d\u0430 RANK(), \u043d\u043e \u0440\u0430\u0431\u043e\u0442\u0430\u0435\u0442 \r\n\u00ab\u043f\u043b\u043e\u0442\u043d\u0435\u0435\u00bb. \u042d\u0442\u043e \u0437\u043d\u0430\u0447\u0438\u0442, \u0447\u0442\u043e \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0438\u0439 \u0440\u0430\u043d\u0433 \u0443\u0432\u0435\u043b\u0438\u0447\u0438\u0432\u0430\u0435\u0442\u0441\u044f \u043d\u0430 1, \u043d\u0435\u0437\u0430\u0432\u0438\u0441\u0438\u043c\u043e \u043e\u0442 \u043a\u043e\u043b\u0438\u0447\u0435\u0441\u0442\u0432\u0430 \u0441\u0442\u0440\u043e\u043a \u0441 \u043e\u0434\u0438\u043d\u0430\u043a\u043e\u0432\u044b\u043c \u0440\u0430\u043d\u0433\u043e\u043c.\r\n\r\n\u041d\u0430\u043f\u0438\u0448\u0435\u043c \u043f\u0440\u043e\u0441\u0442\u043e\u0439 \u0437\u0430\u043f\u0440\u043e\u0441 \u0441 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435\u043c \r\n\u0444\u0443\u043d\u043a\u0446\u0438\u0438 DENSE_RANK():\r\n\r\nSELECT id, sale_date, department, sales, DENSE_RANK() OVER (PARTITION BY \r\nsale_date ORDER BY sales) AS dn_rank_s FROM sport_sales;\r\n\r\n\u0412 \u044d\u0442\u043e\u043c \u043f\u0440\u0438\u043c\u0435\u0440\u0435 SQL-\u0437\u0430\u043f\u0440\u043e\u0441 \u0442\u0430\u043a\u0436\u0435 \u043f\u0440\u0438\u0441\u0432\u0430\u0438\u0432\u0430\u0435\u0442 \r\n\u0441\u0442\u0440\u043e\u043a\u0430\u043c \u0440\u0430\u043d\u0433 \u0432 \u043f\u043e\u0440\u044f\u0434\u043a\u0435 \u0432\u043e\u0437\u0440\u0430\u0441\u0442\u0430\u043d\u0438\u044f \u043a\u043e\u043b\u0438\u0447\u0435\u0441\u0442\u0432\u0430 \u043f\u0440\u043e\u0434\u0430\u0436. \u0415\u0441\u043b\u0438 \u043a\u043e\u043b\u0438\u0447\u0435\u0441\u0442\u0432\u043e \u043f\u0440\u043e\u0434\u0430\u0436 \u043e\u0434\u0438\u043d\u0430\u043a\u043e\u0432\u043e (id 5 \u0438 6), \u0442\u043e \u0431\u0443\u0434\u0435\u0442 \u043f\u0440\u0438\u0441\u0432\u043e\u0435\u043d \u0440\u0430\u043d\u0433 1, \u0430 \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0435\u0439 \u043f\u043e \u043f\u043e\u0440\u044f\u0434\u043a\u0443 \u0441\u0442\u0440\u043e\u043a\u0435 (id 4) \u2014 \u0440\u0430\u043d\u0433 2. \u0412\u043e\u0442 \u043a\u0430\u043a \u044d\u0442\u043e \u043e\u0442\u0440\u0430\u0436\u0430\u0435\u0442\u0441\u044f \u0432 \u0442\u0430\u0431\u043b\u0438\u0446\u0435:\r\n\r\nid sale_date department sales dn_rank_s \r\n2 2024-02-01 Clothing 5 1 \r\n1 2024-02-01 Shoes 6 2 \r\n3 2024-02-01 Equipment 10 3 \r\n5 2024-02-02 Equipment 4 1 \r\n6 2024-02-02 Shoes 4 1 \r\n4 2024-02-02 Clothing 6 2 \r\n9 2024-02-03 Clothing 4 1 \r\n7 2024-02-03 Shoes 8 2 \r\n8 2024-02-03 Equipment 10 3 \r\n\r\n\r\n\u0424\u0443\u043d\u043a\u0446\u0438\u044f ROW_NUMBER(). \u041f\u0440\u0438\u0441\u0432\u0430\u0438\u0432\u0430\u0435\u0442 \u0443\u043d\u0438\u043a\u0430\u043b\u044c\u043d\u044b\u0439 \r\n\u043f\u043e\u0440\u044f\u0434\u043a\u043e\u0432\u044b\u0439 \u043d\u043e\u043c\u0435\u0440 \u043a\u0430\u0436\u0434\u043e\u0439 \u0441\u0442\u0440\u043e\u043a\u0435 \u0432 \u0440\u0430\u0437\u0434\u0435\u043b\u0435 \u043e\u043a\u043d\u0430.\r\n\r\nSQL-\u0437\u0430\u043f\u0440\u043e\u0441 \u0432\u044b\u0433\u043b\u044f\u0434\u0438\u0442 \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0438\u043c \u043e\u0431\u0440\u0430\u0437\u043e\u043c:\r\n\r\nSELECT id, sale_date, department, sale, ROW_NUMBER() OVER (PARTITION BY \r\nsale_date ORDER BY department) AS row_n FROM sport_sales;\r\n\r\n\u0412 \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442\u0435 \u0432\u0441\u0435 \u0434\u0430\u043d\u043d\u044b\u0435 \u0440\u0430\u0441\u0441\u043e\u0440\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u044b \r\n\u043f\u043e \u0434\u0430\u0442\u0430\u043c \u043f\u0440\u043e\u0434\u0430\u0436 \u0438 \u043e\u0442\u043c\u0435\u0447\u0435\u043d\u044b \u0443\u043d\u0438\u043a\u0430\u043b\u044c\u043d\u044b\u043c\u0438 \u043d\u043e\u043c\u0435\u0440\u0430\u043c\u0438:\r\n\r\nid sale_date department sales row_n \r\n2 2024-02-01 Clothing 5 1 \r\n3 2024-02-01 Equipment 10 2 \r\n1 2024-02-01 Shoes 6 3 \r\n4 2024-02-02 Clothing 6 1 \r\n5 2024-02-02 Equipment 4 2 \r\n6 2024-02-02 Shoes 4 3 \r\n9 2024-02-03 Clothing 4 1 \r\n8 2024-02-03 Equipment 10 2 \r\n7 2024-02-03 Shoes 8 3 \r\n\u0424\u0443\u043d\u043a\u0446\u0438\u0438 \u0441\u043c\u0435\u0449\u0435\u043d\u0438\u044f\r\n\r\n\u0424\u0443\u043d\u043a\u0446\u0438\u0438 \u0441\u043c\u0435\u0449\u0435\u043d\u0438\u044f \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0442 \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u0442\u044c \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0438 \r\n\u043d\u0430\u0434 \u0442\u0435\u043a\u0443\u0449\u0435\u0439 \u0441\u0442\u0440\u043e\u043a\u043e\u0439, \u0432 \u0437\u0430\u0432\u0438\u0441\u0438\u043c\u043e\u0441\u0442\u0438 \u043e\u0442 \u0434\u0440\u0443\u0433\u0438\u0445 \u0441\u0442\u0440\u043e\u043a \u0432 \u043e\u043a\u043d\u0435. \u041e\u043d\u0438 \u0431\u044b\u0432\u0430\u044e\u0442 \u043f\u043e\u043b\u0435\u0437\u043d\u044b, \u043a\u043e\u0433\u0434\u0430 \u043d\u0443\u0436\u043d\u043e \u0430\u043d\u0430\u043b\u0438\u0437\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u043f\u043e\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u0438 \u0438\u043b\u0438 \u0432\u0440\u0435\u043c\u0435\u043d\u043d\u044b\u0435 \u0440\u044f\u0434\u044b \u0434\u0430\u043d\u043d\u044b\u0445.\r\n\r\n\u041e\u0441\u043d\u043e\u0432\u043d\u044b\u0435 \u0444\u0443\u043d\u043a\u0446\u0438\u0438 \u0441\u043c\u0435\u0449\u0435\u043d\u0438\u044f:\r\n\r\n\u0424\u0443\u043d\u043a\u0446\u0438\u044f LEAD(). \u041f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u0437\u0430\u0433\u043b\u044f\u043d\u0443\u0442\u044c \u0432\u043f\u0435\u0440\u0451\u0434 \r\n\u043d\u0430 \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u043e\u0435 \u043a\u043e\u043b\u0438\u0447\u0435\u0441\u0442\u0432\u043e \u0441\u0442\u0440\u043e\u043a \u043e\u0442 \u0442\u0435\u043a\u0443\u0449\u0435\u0439 \u0438 \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 \u0438\u0437 \u0441\u0442\u043e\u043b\u0431\u0446\u0430 \u0432 \u044d\u0442\u0438\u0445 \u0441\u0442\u0440\u043e\u043a\u0430\u0445.\r\n\r\n\u041a \u043f\u0440\u0438\u043c\u0435\u0440\u0443, \u0437\u0430\u043f\u0440\u043e\u0441 \u043c\u043e\u0436\u0435\u0442 \u0432\u044b\u0433\u043b\u044f\u0434\u0435\u0442\u044c \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0438\u043c \r\n\u043e\u0431\u0440\u0430\u0437\u043e\u043c:\r\n\r\nSELECT id, sale_date, department, sales, LEAD(sales, 1) OVER (PARTITION \r\nBY department ORDER BY sale_date) AS next_day_s FROM sport_sales; \r\n\r\n\u0412 \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442\u0435 \u0434\u043b\u044f \u043a\u0430\u0436\u0434\u043e\u0433\u043e \u043e\u0442\u0434\u0435\u043b\u0430 \u0437\u0430\u043f\u0440\u043e\u0441 \r\n\u0432\u043e\u0437\u0432\u0440\u0430\u0449\u0430\u0435\u0442 \u043f\u0440\u043e\u0434\u0430\u0436\u0438 \u0442\u0435\u043a\u0443\u0449\u0435\u0433\u043e \u0434\u043d\u044f (sales) \u0438 \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0435\u0433\u043e (next_day_s):\r\n\r\nid sale_date department sales next_day_s \r\n2 2024-02-01 Clothing 5 6 \r\n4 2024-02-02 Clothing 6 4 \r\n9 2024-02-03 Clothing 4 None \r\n3 2024-02-01 Equipment 10 4 \r\n5 2024-02-02 Equipment 4 10 \r\n8 2024-02-03 Equipment 10 None \r\n1 2024-02-01 Shoes 6 4 \r\n6 2024-02-02 Shoes 4 8 \r\n7 2024-02-03 Shoes 8 None \r\n\r\n\r\n\u0424\u0443\u043d\u043a\u0446\u0438\u044f LAG(). \u041f\u043e\u0445\u043e\u0436\u0430 \u043d\u0430 LEAD(), \u043d\u043e, \u0432\u043c\u0435\u0441\u0442\u043e \r\n\u0442\u043e\u0433\u043e \u0447\u0442\u043e\u0431\u044b \u00ab\u0437\u0430\u0433\u043b\u044f\u0434\u044b\u0432\u0430\u0442\u044c \u0432\u043f\u0435\u0440\u0451\u0434\u00bb, \u044d\u0442\u0430 \u0444\u0443\u043d\u043a\u0446\u0438\u044f \u00ab\u0441\u043c\u043e\u0442\u0440\u0438\u0442 \u043d\u0430\u0437\u0430\u0434\u00bb \u043d\u0430 \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u043e\u0435 \u043a\u043e\u043b\u0438\u0447\u0435\u0441\u0442\u0432\u043e \u0441\u0442\u0440\u043e\u043a.\r\n\r\n\u0417\u0434\u0435\u0441\u044c \u0432 \u043a\u0430\u0436\u0434\u043e\u0439 \u0441\u0442\u0440\u043e\u043a\u0435 \u043e\u043a\u043d\u0430 \u0441\u0442\u043e\u043b\u0431\u0435\u0446 sales \r\n\u043f\u043e\u043a\u0430\u0436\u0435\u0442 \u043f\u0440\u043e\u0434\u0430\u0436\u0438 \u0442\u0435\u043a\u0443\u0449\u0435\u0433\u043e, \u0430 \u0441\u0442\u043e\u043b\u0431\u0435\u0446 last_day_s \u2014 \u043f\u0440\u043e\u0434\u0430\u0436\u0438 \u043f\u0440\u0435\u0434\u044b\u0434\u0443\u0449\u0435\u0433\u043e \u0434\u043d\u044f \u0434\u043b\u044f \u043a\u0430\u0436\u0434\u043e\u0433\u043e \u043e\u0442\u0434\u0435\u043b\u0430:\r\n\r\nid sale_date department sales last_day_s \r\n2 2024-02-01 Clothing 5 None \r\n4 2024-02-02 Clothing 6 5 \r\n9 2024-02-03 Clothing 4 6 \r\n3 2024-02-01 Equipment 10 None \r\n5 2024-02-02 Equipment 4 10 \r\n8 2024-02-03 Equipment 10 4 \r\n1 2024-02-01 Shoes 6 None \r\n6 2024-02-02 Shoes 4 6 \r\n7 2024-02-03 Shoes 8 4 \r\n\r\n\r\n\u0424\u0443\u043d\u043a\u0446\u0438\u0438 FIRST_VALUE() \u0438 LAST_VALUE(). \u042d\u0442\u0438 \u0444\u0443\u043d\u043a\u0446\u0438\u0438 \u0432\u043e\u0437\u0432\u0440\u0430\u0449\u0430\u044e\u0442 \r\n\u043f\u0435\u0440\u0432\u043e\u0435 \u0438 \u043f\u043e\u0441\u043b\u0435\u0434\u043d\u0435\u0435 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 \u0441\u0442\u043e\u043b\u0431\u0446\u0430 \u0432 \u043e\u043a\u043d\u0435 \u0441\u043e\u043e\u0442\u0432\u0435\u0442\u0441\u0442\u0432\u0435\u043d\u043d\u043e.\r\n\r\n\u0421 \u043f\u043e\u043c\u043e\u0449\u044c\u044e \u0432\u043e\u0442 \u0442\u0430\u043a\u043e\u0433\u043e \u0437\u0430\u043f\u0440\u043e\u0441\u0430 \u043c\u043e\u0436\u043d\u043e \u0432\u044b\u0432\u0435\u0441\u0442\u0438 \r\n\u043f\u0440\u043e\u0434\u0430\u0436\u0438 \u0442\u0435\u043a\u0443\u0449\u0435\u0433\u043e \u0434\u043d\u044f \u0438 \u043f\u0440\u043e\u0434\u0430\u0436\u0438 \u0437\u0430 \u043f\u0435\u0440\u0432\u043e\u0435 \u0438 \u0442\u0440\u0435\u0442\u044c\u0435 \u0447\u0438\u0441\u043b\u043e \u0434\u043b\u044f \u043a\u0430\u0436\u0434\u043e\u0433\u043e \u043e\u0442\u0434\u0435\u043b\u0430:\r\n\r\nSELECT id, sale_date, department, sale, FIRST_VALUE(sale) OVER (PARTITION \r\nBY department ORDER BY sale_date) AS first_sale, LAST_VALUE(sale) OVER (PARTITION BY department ORDER BY sale_date) AS last_sale FROM sport_sales;\r\n\r\n\u0420\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442 \u0440\u0430\u0431\u043e\u0442\u044b \u0437\u0430\u043f\u0440\u043e\u0441\u0430 \u0432\u044b\u0433\u043b\u044f\u0434\u0438\u0442 \u0442\u0430\u043a:\r\n\r\nid sale_date department sales first_sale last_sale \r\n2 2024-02-01 Clothing 5 5 4 \r\n4 2024-02-02 Clothing 6 5 4 \r\n9 2024-02-03 Clothing 4 5 4 \r\n3 2024-02-01 Equipment 10 10 10 \r\n5 2024-02-02 Equipment 4 10 10 \r\n8 2024-02-03 Equipment 10 10 10 \r\n1 2024-02-01 Shoes 6 6 8 \r\n6 2024-02-02 Shoes 4 6 8 \r\n7 2024-02-03 Shoes 8 6 8 \r\n\r\n\r\n\r\n\r\n \r\n\r\n\r\n\u0427\u0438\u0442\u0430\u0439\u0442\u0435 \u0442\u0430\u043a\u0436\u0435:\r\n\r\n\u0421\u0438\u0441\u0442\u0435\u043c\u0430 \u0443\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u044f \u0431\u0430\u0437\u0430\u043c\u0438 \u0434\u0430\u043d\u043d\u044b\u0445: \u0447\u0442\u043e \u044d\u0442\u043e \r\n\u0442\u0430\u043a\u043e\u0435 \u0438 \u0437\u0430\u0447\u0435\u043c \u043e\u043d\u0430 \u043d\u0443\u0436\u043d\u0430 \r\n\r\n\u0412 \u0437\u0430\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u0435\r\n\r\n\u041e\u043a\u043e\u043d\u043d\u044b\u0435 \u0444\u0443\u043d\u043a\u0446\u0438\u0438 \u0434\u0435\u043b\u0430\u044e\u0442 SQL-\u0437\u0430\u043f\u0440\u043e\u0441\u044b \u0431\u043e\u043b\u0435\u0435 \r\n\u0433\u0438\u0431\u043a\u0438\u043c\u0438 \u0438 \u043c\u043e\u0449\u043d\u044b\u043c\u0438. \u041e\u043d\u0438 \u043f\u043e\u043c\u043e\u0433\u0430\u044e\u0442 \u0438\u0437\u0431\u0435\u0436\u0430\u0442\u044c \u043f\u043e\u0442\u0435\u0440\u044c \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u0438, \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u0441\u043e\u0434\u0435\u0440\u0436\u0438\u0442\u0441\u044f \u0432 \u043a\u0430\u0436\u0434\u043e\u0439 \u0441\u0442\u0440\u043e\u043a\u0435 \u0438\u0441\u0445\u043e\u0434\u043d\u044b\u0445 \u0434\u0430\u043d\u043d\u044b\u0445. \u0410 \u0435\u0449\u0451 \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u044e\u0442 \u0440\u0430\u0437\u043b\u0438\u0447\u043d\u044b\u0435 \u0440\u0430\u0441\u0447\u0451\u0442\u044b \u0441 \u0442\u0430\u0431\u043b\u0438\u0446\u0430\u043c\u0438 \u2014 \u043d\u0430\u043f\u0440\u0438\u043c\u0435\u0440, \u0440\u0430\u043d\u0436\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0435, \u0441\u0443\u043c\u043c\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0435 \u0438\u043b\u0438 \u0432\u044b\u0432\u0435\u0434\u0435\u043d\u0438\u0435 \u0441\u0442\u0430\u0442\u0438\u0441\u0442\u0438\u043a\u0438.\r\n\r\n\u041e\u043a\u043e\u043d\u043d\u044b\u0435 \u0444\u0443\u043d\u043a\u0446\u0438\u0438 \u043e\u043f\u0435\u0440\u0438\u0440\u0443\u044e\u0442 \u0432 \u043a\u043e\u043d\u0442\u0435\u043a\u0441\u0442\u0435 \r\n\u00ab\u043e\u043a\u043d\u0430\u00bb \u2014 \u043f\u043e\u0434\u043c\u043d\u043e\u0436\u0435\u0441\u0442\u0432\u0430 \u0442\u0430\u0431\u043b\u0438\u0446\u044b \u0438 \u0434\u043e\u0431\u0430\u0432\u043b\u044f\u044e\u0442 \u043d\u043e\u0432\u0443\u044e \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044e \u0432 \u043e\u0442\u0434\u0435\u043b\u044c\u043d\u044b\u0435 \u0441\u0442\u043e\u043b\u0431\u0446\u044b. \u041e\u043d\u0438 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0442 \u0438\u0437\u0431\u0435\u0436\u0430\u0442\u044c \u0434\u043e\u043f\u043e\u043b\u043d\u0438\u0442\u0435\u043b\u044c\u043d\u044b\u0445 \u0437\u0430\u043f\u0440\u043e\u0441\u043e\u0432, \u0447\u0442\u043e \u0443\u043f\u0440\u043e\u0449\u0430\u0435\u0442 \u0440\u0430\u0431\u043e\u0442\u0443 \u0441 \u0431\u0430\u0437\u0430\u043c\u0438 \u0434\u0430\u043d\u043d\u044b\u0445 \u0438 \u0434\u0435\u043b\u0430\u0435\u0442 SQL-\u0437\u0430\u043f\u0440\u043e\u0441\u044b \u0431\u043e\u043b\u0435\u0435 \u0447\u0438\u0442\u0430\u0435\u043c\u044b\u043c\u0438.\r\n\r\n\r\n\r\n \r\n\r\n \r\n\r\n\r\n\u0411\u043e\u043b\u044c\u0448\u0435 \u0438\u043d\u0442\u0435\u0440\u0435\u0441\u043d\u043e\u0433\u043e \u043f\u0440\u043e \u043a\u043e\u0434 \u2014 \u0432 \u043d\u0430\u0448\u0435\u043c \r\n\u0442\u0435\u043b\u0435\u0433\u0440\u0430\u043c-\u043a\u0430\u043d\u0430\u043b\u0435 . \u041f\u043e\u0434\u043f\u0438\u0441\u044b\u0432\u0430\u0439\u0442\u0435\u0441\u044c!\r\n\r\n\r\n\r\n\r\n\r\n\u0427\u0438\u0442\u0430\u0439\u0442\u0435 \u0442\u0430\u043a\u0436\u0435:\r\n\r\n- SQL \u0438 NoSQL: \u0438\u043d\u044c \u0438 \u044f\u043d \u0432 \u043c\u0438\u0440\u0435 \u0431\u0430\u0437 \u0434\u0430\u043d\u043d\u044b\u0445 \r\n \r\n- \u00ab\u042f \u0433\u043e\u0442\u043e\u0432 \u043a\u043e\u043f\u0430\u0442\u044c\u0441\u044f \u0432 \u0434\u0430\u043d\u043d\u044b\u0445 \u0441\u0443\u0442\u043a\u0438 \r\n\u043d\u0430\u043f\u0440\u043e\u043b\u0451\u0442\u00bb: \u0438\u0441\u0442\u043e\u0440\u0438\u044f \u0433\u0435\u043e\u043b\u043e\u0433\u0430, \u0441\u0442\u0430\u0432\u0448\u0435\u0433\u043e \u0430\u043d\u0430\u043b\u0438\u0442\u0438\u043a\u043e\u043c \r\n- \u0417\u0430\u0440\u043f\u043b\u0430\u0442\u044b \u0430\u043d\u0430\u043b\u0438\u0442\u0438\u043a\u043e\u0432 \u0434\u0430\u043d\u043d\u044b\u0445 \u0440\u0430\u0437\u043d\u043e\u0433\u043e \u0443\u0440\u043e\u0432\u043d\u044f \r\n\u0432 \u0420\u043e\u0441\u0441\u0438\u0438: \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u043d\u0438\u0435 Skillbox Media \r\n\r\n\r\n\r\n\r\n\u0410\u0433\u0440\u0435\u0433\u0430\u0442\u043d\u044b\u0435 \u0444\u0443\u043d\u043a\u0446\u0438\u0438 \u2014 \u0444\u0443\u043d\u043a\u0446\u0438\u0438, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \r\n\u043f\u0440\u043e\u0432\u043e\u0434\u044f\u0442 \u0432\u044b\u0447\u0438\u0441\u043b\u0435\u043d\u0438\u044f \u043d\u0430 \u0433\u0440\u0443\u043f\u043f\u0435 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0439 \u0438 \u0432\u043e\u0437\u0432\u0440\u0430\u0449\u0430\u044e\u0442 \u0435\u0434\u0438\u043d\u043e\u0435 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435.","author":{"@type":"Person","name":"\u041c\u0430\u0440\u0438\u043d\u0430 \u0414\u0435\u043c\u0438\u0434\u043e\u0432\u0430","url":"https:\/\/skillbox.ru\/media\/authors\/marina-demidova\/"},"publisher":{"@type":"Organization","name":"Skillbox","logo":{"@type":"ImageObject","url":"https:\/\/skillbox.ru\/static\/images\/skillbox.png"}},"mainEntityOfPage":{"@type":"WebPage","url":"https:\/\/skillbox.ru\/media\/code\/okonnye-funktsii-v-sql-chto-eto-i-zachem-oni-nuzhny\/"},"datePublished":"2024-06-26T07:25:00Z","dateModified":"2025-03-04T21:59:48Z","image":{"@type":"ImageObject","url":["https:\/\/248006.selcdn.ru\/main\/iblock\/c85\/c851b3f4479817e3ff3ccbd598276ee0\/1f5aac130b2e1dc5454b8d7285d2de89.png"]},"description":"\u0420\u0430\u0441\u0441\u043a\u0430\u0437\u044b\u0432\u0430\u0435\u043c, \u043a\u0430\u043a \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u044c \u0430\u0433\u0440\u0435\u0433\u0430\u0442\u043d\u044b\u0435 \u0432\u044b\u0447\u0438\u0441\u043b\u0435\u043d\u0438\u044f \u0438 \u043d\u0435 \u0442\u0435\u0440\u044f\u0442\u044c \u0438\u0441\u0445\u043e\u0434\u043d\u044b\u0435 \u0441\u0442\u0440\u043e\u043a\u0438."}
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