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Добавил запросы в init.sql. Нужно будет нажать на Сброс, чтобы получить новую версию упражнения. Если у вас есть уже какие-то наработки, скопируйте их, при сбросе все удалится ","topic_id":98979}],"communitable":{"parent_entity_name":null,"parent_entity_url":null,"entity_name":"Common Table Expression и Конструкция WITH","entity_url":null,"active":true}},{"id":101023,"title":"Пока не поправили, решается через CASE","plain_title":"Пока не поправили, решается через CASE ","creator":{"public_name":"Максим Латухин","id":822058,"is_tutor":false},"comments":[{"creator":{"public_name":"Maksim Litvinov","id":198906,"is_tutor":true},"id":192925,"body":"Спасибо, доберемся и до этой задачи) ","topic_id":101023}],"communitable":{"parent_entity_name":null,"parent_entity_url":null,"entity_name":"Common Table Expression и Конструкция WITH","entity_url":null,"active":true}},{"id":100602,"title":"Здравствуйте, уважаемая поддержка, как так чтобы решить УПРАЖНЕНИЕ из урока 5 где в теории совсем не рассказывали про УСЛОВНЫЕ АГРЕГАЦИИ CASE , мне сначала пришлось изучить урок 6 и доп. информацию на просторах интернета про УСЛОВНЫЕ АГРЕГАЦИИ CASE, для того чтобы решить упражнение в уроке 5 и получить за это упражнение балы.\nПришлось очень много времени потратить на решение и каждый раз когда запрос не срабатывал смотреть все ошибки. \nЕсли бы не терпение я бы воспользовался просто подсказкой и посмотрел бы код правильного решения, где как оказалось решено с помощью УСЛОВНЫХ АГРЕГАЦИИ CASE про которые нет в уроке 5.","plain_title":"Здравствуйте, уважаемая поддержка, как так чтобы решить УПРАЖНЕНИЕ из урока 5 где в теории совсем не рассказывали про УСЛОВНЫЕ АГРЕГАЦИИ CASE , мне сначала пришлось изучить урок 6 и доп. информацию на просторах интернета про УСЛОВНЫЕ АГРЕГАЦИИ CASE, для того чтобы решить упражнение в уроке 5 и получить за это упражнение балы. Пришлось очень много времени потратить на решение и каждый раз когда запрос не срабатывал смотреть все ошибки. Если бы не терпение я бы воспользовался просто подсказкой и посмотрел бы код правильного решения, где как оказалось решено с помощью УСЛОВНЫХ АГРЕГАЦИИ CASE про которые нет в уроке 5. ","creator":{"public_name":"Роман Ибадов","id":800092,"is_tutor":false},"comments":[{"creator":{"public_name":"Ivan Mamtsev","id":294764,"is_tutor":true},"id":192431,"body":"Спасибо за замечание, упростим задачку.","topic_id":100602}],"communitable":{"parent_entity_name":null,"parent_entity_url":null,"entity_name":"Common Table Expression и Конструкция WITH","entity_url":null,"active":true}},{"id":107691,"title":"Вопрос, зачем в решении учителя используется объединение с таблицей customers, которая по факту совершенно не нужна для расчетов и получения правильного ответа?","plain_title":"Вопрос, зачем в решении учителя используется объединение с таблицей customers, которая по факту совершенно не нужна для расчетов и получения правильного ответа? ","creator":{"public_name":"Алёна","id":916615,"is_tutor":false},"comments":[{"creator":{"public_name":"Вугар Дамиров","id":598233,"is_tutor":true},"id":201730,"body":"Привет! Он нужен для INNER JOIN. Таким способом мы отсечем все значения заказов без клиентов из таблицы клиентов","topic_id":107691}],"communitable":{"parent_entity_name":null,"parent_entity_url":null,"entity_name":"Common Table Expression и Конструкция WITH","entity_url":null,"active":true}}],"lesson":{"exercise":{"id":2420,"slug":"complex_sql_queries_with_exercise","name":null,"state":"active","kind":"exercise","language":"sql","locale":"ru","has_web_view":false,"has_test_view":false,"reviewable":true,"readme":"В таблице `customers` хранятся данные о покупателях:\n\n* `id` — id покупателя\n* `name` — имя покупателя\n\n**customers**\n\n| id | name |\n|----|----------------|\n| 1 | Tracy Johnson |\n| 2 | Martha Gregory |\n| 3 | Amy Murphy |\n\nВ таблице `purchases` хранятся данные о продажах:\n\n* `purchase_id` — id продажи\n* `customer_id` — id покупателя\n* `amount` - сумма продажи\n\n**purchases**\n\n| purchase_id | customer_id | amount |\n|-------------|-------------|---------|\n| 1 | 2 | 204.0 |\n| 2 | 1 | 464.0 |\n| 3 | 12 | 366.0 |\n| 4 | 1 | 170.0 |\n| 5 | 3 | 290.0 |\n\n## solution.sql\n\nНапишите запрос, который сегментирует клиентов на основе общей суммы их покупок (`'Low'`, `'Medium'`, `'High'`) и подсчитывает количество клиентов в каждом сегменте.\n\nКатегории:\n\n- `'Low'` - меньше 500\n- `'Medium'` - от 500 до 1000\n- `'High'` - больше 1000\n\nВ результате должна получиться следующая таблица:\n\n| category | category_count |\n|----------|----------------|\n|'Low' | 3 |\n|'High' | 6 |\n|'Medium' | 11 |\n\nОтсортируйте полученный результат по `category_count` ASC\n\n### Подсказки\n\n* Перед тем, как писать запросы в файл, можно зайти в репл `psql` в терминале и поэкспериментировать\n","prepared_readme":"В таблице `customers` хранятся данные о покупателях:\n\n* `id` — id покупателя\n* `name` — имя покупателя\n\n**customers**\n\n| id | name |\n|----|----------------|\n| 1 | Tracy Johnson |\n| 2 | Martha Gregory |\n| 3 | Amy Murphy |\n\nВ таблице `purchases` хранятся данные о продажах:\n\n* `purchase_id` — id продажи\n* `customer_id` — id покупателя\n* `amount` - сумма продажи\n\n**purchases**\n\n| purchase_id | customer_id | amount |\n|-------------|-------------|---------|\n| 1 | 2 | 204.0 |\n| 2 | 1 | 464.0 |\n| 3 | 12 | 366.0 |\n| 4 | 1 | 170.0 |\n| 5 | 3 | 290.0 |\n\n## solution.sql\n\nНапишите запрос, который сегментирует клиентов на основе общей суммы их покупок (`'Low'`, `'Medium'`, `'High'`) и подсчитывает количество клиентов в каждом сегменте.\n\nКатегории:\n\n- `'Low'` - меньше 500\n- `'Medium'` - от 500 до 1000\n- `'High'` - больше 1000\n\nВ результате должна получиться следующая таблица:\n\n| category | category_count |\n|----------|----------------|\n|'Low' | 3 |\n|'High' | 6 |\n|'Medium' | 11 |\n\nОтсортируйте полученный результат по `category_count` ASC\n\n### Подсказки\n\n* Перед тем, как писать запросы в файл, можно зайти в репл `psql` в терминале и поэкспериментировать\n","has_solution":true,"entity_name":"Common Table Expression и Конструкция WITH"},"units":[{"id":8331,"name":"theory","url":"/courses/complex-sql-queries/lessons/with/theory_unit"},{"id":9736,"name":"quiz","url":"/courses/complex-sql-queries/lessons/with/quiz_unit"},{"id":8343,"name":"exercise","url":"/courses/complex-sql-queries/lessons/with/exercise_unit"}],"links":[],"ordered_units":[{"id":8331,"name":"theory","url":"/courses/complex-sql-queries/lessons/with/theory_unit"},{"id":9736,"name":"quiz","url":"/courses/complex-sql-queries/lessons/with/quiz_unit"},{"id":8343,"name":"exercise","url":"/courses/complex-sql-queries/lessons/with/exercise_unit"}],"id":3693,"slug":"with","state":"approved","name":"Common Table Expression и Конструкция WITH","course_order":150,"goal":"Изучаем, как рассчитывать разные метрики на одной таблице","self_study":null,"theory_video_provider":"vimeo","theory_video_uid":"833957561","theory":"Конструкция Common Table Expressions (CTE) создает именованную временную таблицу, которая может быть использована в подзапросах, объединениях, агрегатных функциях и других операциях.\n\nПреимущество использования CTE заключается в возможности переиспользования подзапросов и создании более читаемого и удобного для понимания кода.\n\nПредположим, у нас есть таблица с продажами товаров и таблица с покупателями\n\n**sales**\n\n| customer_id | product_id | sale_date | quantity | total_price |\n| --- | --- | --- | --- | --- |\n| 1 | 10928473 | '2023-03-08' | 1 | 28499.99 |\n| 2 | 20483739 | '2023-03-09' | 2 | 9998.00 |\n| 3 | 73648393 | '2023-03-10' | 3 | 3297.00 |\n\n**customers**\n\n| id | name |\n| --- | --- |\n| 1 | John Doe |\n| 2 | Jane Smith |\n| 3 | ... |\n\nМы можем использовать CTE, например, для определения временной таблицы `top_customers`, которая содержит информацию о топ-5 клиентах по количеству сделанных заказов:\n\n```sql\nWITH top_customers AS (\n SELECT\n customer_id,\n COUNT(*) AS order_count\n FROM sales\n GROUP BY customer_id\n ORDER BY order_count DESC\n LIMIT 5\n)\n\nSELECT\n c.id,\n c.name,\n tc.order_count\nFROM customers AS c\nINNER JOIN top_customers AS tc ON c.id = tc.customer_id;\n```\n\n**top_customers**\n\n| id | name | order_count |\n| --- | --- | --- |\n| 1 | John Doe | 6 |\n| 2 | Jane Smith | 6 |\n| 4 | Sarah Miller | 5 |\n| 5 | Robert Brown | 5 |\n| 10 | Susan Davis | 5 |\n\n[Таблица на DB Fiddle](https://www.db-fiddle.com/f/3cZsNtBtWo2cfb2jEMnH9C/0)\n\nCTE позволяет создавать более читаемый и структурированный код, а также улучшает производительность запросов, так как подзапросы могут быть выполнены только один раз и результаты могут быть переиспользованы.\n"},"lessonMember":null,"courseMember":null,"course":{"start_lesson":{"exercise":null,"units":[{"id":7103,"name":"theory","url":"/courses/complex-sql-queries/lessons/intro/theory_unit"}],"links":[],"ordered_units":[{"id":7103,"name":"theory","url":"/courses/complex-sql-queries/lessons/intro/theory_unit"}],"id":3146,"slug":"intro","state":"approved","name":"Введение","course_order":100,"goal":"Знакомимся с темой курса","self_study":null,"theory_video_provider":null,"theory_video_uid":null,"theory":"На этом курсе вы научитесь работать с накопительной агрегацией и писать сложные SQL-запросы для решения задач в аналитике. Полученные навыки пригодятся, если вы решите рассчитать разные метрики на одной и той же таблице и объединить их в результате. Знания из этого курса помогут производить несколько уровней вычислений над таблицей, а также использовать сложные формулы с переиспользованием предыдущих шагов.\n\n## Какие темы изучим на курсе\n\nВ рамках курса мы освежим знания базового SQL и изучим следующие темы:\n\n* Подзапросы для вычислений над таблицей в несколько уровней\n* Объединение подзапросов\n* Конструкция `WITH`\n* Условная агрегация `CASE`\n"},"id":304,"slug":"complex-sql-queries","challenges_count":3,"name":"Продвинутые SQL-запросы","allow_indexing":true,"state":"approved","course_state":"finished","pricing_type":"paid","description":"На этом курсе вы научитесь работать с накопительной агрегацией и писать сложные SQL-запросы для решения задач в аналитике. Полученные навыки пригодятся, если вы решите рассчитать разные метрики на одной и той же таблице и объединить их в результате. 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stroke-linecap="round" stroke-linejoin="round" class="tabler-icon tabler-icon-lock "><path d="M5 13a2 2 0 0 1 2 -2h10a2 2 0 0 1 2 2v6a2 2 0 0 1 -2 2h-10a2 2 0 0 1 -2 -2v-6"></path><path d="M11 16a1 1 0 1 0 2 0a1 1 0 0 0 -2 0"></path><path d="M8 11v-4a4 4 0 1 1 8 0v4"></path></svg></div><p style="font-size:var(--mantine-font-size-sm)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">Продвинутые SQL-запросы</p></div><h1 style="--title-fw:var(--mantine-h1-font-weight);--title-lh:var(--mantine-h1-line-height);--title-fz:var(--mantine-h1-font-size);margin-bottom:var(--mantine-spacing-xl)" class="m_8a5d1357 mantine-Title-root" data-order="1">Теория: Common Table Expression и Конструкция WITH</h1><script type="application/ld+json">{"@context":"https://schema.org","@type":"LearningResource","name":"Common Table Expression и Конструкция WITH","inLanguage":"ru","isPartOf":{"@type":"LearningResource","name":"Продвинутые SQL-запросы"},"isAccessibleForFree":"False","hasPart":{"@type":"WebPageElement","isAccessibleForFree":"False","cssSelector":".paywalled"}}</script><div class=""><div style="--alert-color:var(--mantine-color-indigo-light-color);margin-bottom:var(--mantine-spacing-lg);font-size:var(--mantine-font-size-lg)" class="m_66836ed3 mantine-Alert-root" id="mantine-_R_remqrdub_" role="alert" aria-describedby="mantine-_R_remqrdub_-body" aria-labelledby="mantine-_R_remqrdub_-title"><div class="m_a5d60502 mantine-Alert-wrapper"><div class="m_667f2a6a mantine-Alert-icon"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="tabler-icon tabler-icon-rocket "><path d="M4 13a8 8 0 0 1 7 7a6 6 0 0 0 3 -5a9 9 0 0 0 6 -8a3 3 0 0 0 -3 -3a9 9 0 0 0 -8 6a6 6 0 0 0 -5 3"></path><path d="M7 14a6 6 0 0 0 -3 6a6 6 0 0 0 6 -3"></path><path d="M14 9a1 1 0 1 0 2 0a1 1 0 1 0 -2 0"></path></svg></div><div class="m_667c2793 mantine-Alert-body"><div class="m_6a03f287 mantine-Alert-title"><span id="mantine-_R_remqrdub_-title" class="m_698f4f23 mantine-Alert-label">Полный доступ к материалам</span></div><div id="mantine-_R_remqrdub_-body" class="m_7fa78076 mantine-Alert-message"><div style="--group-gap:var(--mantine-spacing-md);--group-align:center;--group-justify:space-between;--group-wrap:wrap" class="m_4081bf90 mantine-Group-root"><p class="mantine-focus-auto m_b6d8b162 mantine-Text-root">Зарегистрируйтесь и получите доступ к этому и десяткам других курсов</p><a style="--button-height:var(--button-height-xs);--button-padding-x:var(--button-padding-x-xs);--button-fz:var(--mantine-font-size-xs);--button-bg:linear-gradient(45deg, var(--mantine-color-blue-filled) 0%, var(--mantine-color-cyan-filled) 100%);--button-hover:linear-gradient(45deg, var(--mantine-color-blue-filled) 0%, var(--mantine-color-cyan-filled) 100%);--button-color:var(--mantine-color-white);--button-bd:none" class="mantine-focus-auto mantine-active m_77c9d27d mantine-Button-root m_87cf2631 mantine-UnstyledButton-root" data-variant="gradient" data-size="xs" href="/u/new"><span class="m_80f1301b mantine-Button-inner"><span class="m_811560b9 mantine-Button-label">Зарегистрироваться</span></span></a></div></div></div></div></div><div class="paywalled m_d08caa0 mantine-Typography-root"><p>Конструкция Common Table Expressions (CTE) создает именованную временную таблицу, которая может быть использована в подзапросах, объединениях, агрегатных функциях и других операциях.</p>
<p>Преимущество использования CTE заключается в возможности переиспользования подзапросов и создании более читаемого и удобного для понимания кода.</p>
<p>Предположим, у нас есть таблица с продажами товаров и таблица с покупателями</p>
<p><strong>sales</strong></p>
<div style="--table-min-width:calc(50rem * var(--mantine-scale));--sa-corner-width:0px;--sa-corner-height:0px" class="m_a100c15 mantine-TableScrollContainer-scrollContainer m_d57069b5 mantine-ScrollArea-root"><div style="overflow-x:hidden;overflow-y:hidden" class="m_c0783ff9 mantine-ScrollArea-viewport" data-offset-scrollbars="x" data-scrollbars="xy"><div class="m_b1336c6 mantine-ScrollArea-content"><div class="m_62259741 mantine-TableScrollContainer-scrollContainerInner"><table><thead><tr><th>customer_id</th><th>product_id</th><th>sale_date</th><th>quantity</th><th>total_price</th></tr></thead><tbody><tr><td>1</td><td>10928473</td><td>'2023-03-08'</td><td>1</td><td>28499.99</td></tr><tr><td>2</td><td>20483739</td><td>'2023-03-09'</td><td>2</td><td>9998.00</td></tr><tr><td>3</td><td>73648393</td><td>'2023-03-10'</td><td>3</td><td>3297.00</td></tr></tbody></table></div></div></div></div>
<p><strong>customers</strong></p>
<div style="--table-min-width:calc(50rem * var(--mantine-scale));--sa-corner-width:0px;--sa-corner-height:0px" class="m_a100c15 mantine-TableScrollContainer-scrollContainer m_d57069b5 mantine-ScrollArea-root"><div style="overflow-x:hidden;overflow-y:hidden" class="m_c0783ff9 mantine-ScrollArea-viewport" data-offset-scrollbars="x" data-scrollbars="xy"><div class="m_b1336c6 mantine-ScrollArea-content"><div class="m_62259741 mantine-TableScrollContainer-scrollContainerInner"><table><thead><tr><th>id</th><th>name</th></tr></thead><tbody><tr><td>1</td><td>John Doe</td></tr><tr><td>2</td><td>Jane Smith</td></tr><tr><td>3</td><td>...</td></tr></tbody></table></div></div></div></div>
<p>Мы можем использовать CTE, например, для определения временной таблицы <code style="margin-bottom:var(--mantine-spacing-lg)" class="m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight m_e597c321 mantine-CodeHighlight-codeHighlight m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight">top_customers</code>, которая содержит информацию о топ-5 клиентах по количеству сделанных заказов:</p>
<div style="margin-bottom:var(--mantine-spacing-lg)" class="m_e597c321 mantine-CodeHighlight-codeHighlight" dir="ltr"><div class="m_be7e9c9c mantine-CodeHighlight-controls"><button style="--ai-bg:transparent;--ai-hover:transparent;--ai-color:inherit;--ai-bd:none" class="mantine-focus-auto mantine-active m_d498bab7 mantine-CodeHighlight-control m_8d3f4000 mantine-ActionIcon-root m_87cf2631 mantine-UnstyledButton-root" data-variant="none" type="button" aria-label="Copy code"><span class="m_8d3afb97 mantine-ActionIcon-icon"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><path stroke="none" d="M0 0h24v24H0z" fill="none"></path><path d="M8 8m0 2a2 2 0 0 1 2 -2h8a2 2 0 0 1 2 2v8a2 2 0 0 1 -2 2h-8a2 2 0 0 1 -2 -2z"></path><path d="M16 8v-2a2 2 0 0 0 -2 -2h-8a2 2 0 0 0 -2 2v8a2 2 0 0 0 2 2h2"></path></svg></span></button></div><div style="--scrollarea-scrollbar-size:calc(0.25rem * var(--mantine-scale));--sa-corner-width:0px;--sa-corner-height:0px" class="m_f744fd40 mantine-CodeHighlight-scrollarea m_d57069b5 mantine-ScrollArea-root" dir="ltr"><div style="overflow-x:hidden;overflow-y:hidden;overscroll-behavior-inline:none" class="m_c0783ff9 mantine-ScrollArea-viewport" data-scrollbars="xy"><div class="m_b1336c6 mantine-ScrollArea-content"><pre class="m_2c47c4fd mantine-CodeHighlight-pre" style="padding:0"><code class="m_5caae6d3 mantine-CodeHighlight-code">WITH top_customers AS (
SELECT
customer_id,
COUNT(*) AS order_count
FROM sales
GROUP BY customer_id
ORDER BY order_count DESC
LIMIT 5
)
SELECT
c.id,
c.name,
tc.order_count
FROM customers AS c
INNER JOIN top_customers AS tc ON c.id = tc.customer_id;</code></pre></div></div></div><button class="mantine-focus-auto m_c9378bc2 mantine-CodeHighlight-showCodeButton m_87cf2631 mantine-UnstyledButton-root" data-hidden="true" type="button">Expand code</button></div>
<p><strong>top_customers</strong></p>
<div style="--table-min-width:calc(50rem * var(--mantine-scale));--sa-corner-width:0px;--sa-corner-height:0px" class="m_a100c15 mantine-TableScrollContainer-scrollContainer m_d57069b5 mantine-ScrollArea-root"><div style="overflow-x:hidden;overflow-y:hidden" class="m_c0783ff9 mantine-ScrollArea-viewport" data-offset-scrollbars="x" data-scrollbars="xy"><div class="m_b1336c6 mantine-ScrollArea-content"><div class="m_62259741 mantine-TableScrollContainer-scrollContainerInner"><table><thead><tr><th>id</th><th>name</th><th>order_count</th></tr></thead><tbody><tr><td>1</td><td>John Doe</td><td>6</td></tr><tr><td>2</td><td>Jane Smith</td><td>6</td></tr><tr><td>4</td><td>Sarah Miller</td><td>5</td></tr><tr><td>5</td><td>Robert Brown</td><td>5</td></tr><tr><td>10</td><td>Susan Davis</td><td>5</td></tr></tbody></table></div></div></div></div>
<p><a style="text-decoration:underline" class="mantine-focus-auto m_849cf0da m_b6d8b162 mantine-Text-root mantine-Anchor-root" data-underline="hover" href="https://www.db-fiddle.com/f/3cZsNtBtWo2cfb2jEMnH9C/0" rel="noopener noreferrer" target="_blank">Таблица на DB Fiddle</a></p>
<p>CTE позволяет создавать более читаемый и структурированный код, а также улучшает производительность запросов, так как подзапросы могут быть выполнены только один раз и результаты могут быть переиспользованы.</p></div><div style="margin-block:var(--mantine-spacing-xl)" class=""><h2 style="--title-fw:var(--mantine-h2-font-weight);--title-lh:var(--mantine-h2-line-height);--title-fz:var(--mantine-h2-font-size);margin-bottom:var(--mantine-spacing-md)" class="m_8a5d1357 mantine-Title-root" data-order="2">Рекомендуемые программы</h2><style data-mantine-styles="inline">.__m__-_R_2mremqrdub_{--carousel-slide-gap:var(--mantine-spacing-xs);--carousel-slide-size:70%;}@media(min-width: 36em){.__m__-_R_2mremqrdub_{--carousel-slide-gap:var(--mantine-spacing-xl);--carousel-slide-size:50%;}}</style><div style="--carousel-control-size:calc(2.5rem * 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