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Завел тикет. Подумаем, что можно сделать с этим.","topic_id":90666}],"communitable":{"parent_entity_name":null,"parent_entity_url":null,"entity_name":"Подзапрос","entity_url":null,"active":true}},{"id":97939,"title":"А что за непонятный синтаксис в последнем примере:\nSELECT *\n FROM product_price pp\nWHERE pp.price = (SELECT min(ppm.price)\n FROM product_price ppm\n WHERE ppm.product_id = pp.product_id)\nORDER BY pp.product_id, pp.price, pp.store_id\n\n\"FROM product_price pp\" - это из конкретной колонки таблицы рр? Тогда почему без точки?\n\"FROM product_price ppm\" - тот же вопрос. И если в начале идёт таблица, то тут выходит таблица product_price и колонка ppm?\nИли здесь подразумеваются объявления псевдонимов колонок?\nНепонятно как читать.","plain_title":"А что за непонятный синтаксис в последнем примере: SELECT * FROM productprice pp WHERE pp.price = (SELECT min(ppm.price) FROM productprice ppm WHERE ppm.productid = pp.productid) ORDER BY pp.productid, pp.price, pp.storeid \"FROM productprice pp\" - это из конкретной колонки таблицы рр? Тогда почему без точки? \"FROM productprice ppm\" - тот же вопрос. И если в начале идёт таблица, то тут выходит таблица product_price и колонка ppm? Или здесь подразумеваются объявления псевдонимов колонок? Непонятно как читать. ","creator":{"public_name":"Виктор Костинский","id":94706,"is_tutor":false},"comments":[{"creator":{"public_name":"Maksim Litvinov","id":198906,"is_tutor":true},"id":189034,"body":"Приветсвую, Виктор! Это псевдоним для таблицы. Короткие псевдонимы таблиц делают запрос более лаконичным и простым для чтения. Дальше можно использовать этот псевдоним в запросе вместо полного имени таблицы","topic_id":97939},{"creator":{"public_name":"Виктор Костинский","id":94706,"is_tutor":false},"id":189064,"body":"То есть псевдоним можно присвоить без использования \"AS\"?","topic_id":97939},{"creator":{"public_name":"Maksim Litvinov","id":198906,"is_tutor":true},"id":189072,"body":"В большинстве баз данных да, AS можно опустить. Вот кусочек из документации PosgreSql\n\n> Like column aliases, the AS keyword is optional, meaning that you can omit it like this:\n\n```sql\ntable_name alias_name\n```","topic_id":97939}],"communitable":{"parent_entity_name":null,"parent_entity_url":null,"entity_name":"Подзапрос","entity_url":null,"active":true}},{"id":102845,"title":"Ни я ни Тота не смогли понять код в Подзапросы в UPDATE.\n`UPDATE orders\nSET\n price = (\n SELECT products.price\n FROM products\n WHERE products.id = sales.product_id\n ) + 3000\nWHERE id = 1;`\n Как id=1 попадёт в подзапрос. И почему в самом подзапросе в условии where появляется третья таблица. Она нигде не джойниться а просто появляется.","plain_title":"Ни я ни Тота не смогли понять код в Подзапросы в UPDATE. UPDATE orders SET price = ( SELECT products.price FROM products WHERE products.id = sales.product_id ) + 3000 WHERE id = 1; Как id=1 попадёт в подзапрос. И почему в самом подзапросе в условии where появляется третья таблица. Она нигде не джойниться а просто появляется. ","creator":{"public_name":"Олег Хайретдинов","id":26735,"is_tutor":false},"comments":[{"creator":{"public_name":"Олег Хайретдинов","id":26735,"is_tutor":false},"id":195187,"body":"**Ivan Mamtsev**, Да про пример выше. В подзапросе :\n\n`WHERE products.id = sales.product_id`\n\nproducts из FROM получается поиск идёт по этой таблице. Откуда взялась таблица sales","topic_id":102845},{"creator":{"public_name":"Ivan Mamtsev","id":294764,"is_tutor":true},"id":195184,"body":"> Как id=1 попадёт в подзапрос\n\nФильтр where уже применится к результату подзапроса.\n\n > почему в самом подзапросе в условии where появляется третья таблица\n\nНе совсем понял о какой третьей таблице вы говорите. Уточните, это вы все еще про пример выше?","topic_id":102845},{"creator":{"public_name":"Ivan Mamtsev","id":294764,"is_tutor":true},"id":195283,"body":"Ага, тут опечатка, вместо orders должна быть таблица sales. Поправлю, спасибо.","topic_id":102845}],"communitable":{"parent_entity_name":null,"parent_entity_url":null,"entity_name":"Подзапрос","entity_url":null,"active":true}},{"id":103040,"title":"Как-то очень сухо подано. Есть примеры но без описания. Коррелированный подзапрос так вообще как по мне так себе объяснен. Вот пример, где плюс минус расписано и доходчиво объяснено. https://sql-academy.org/ru/guide/correlated-subqueries","plain_title":"Как-то очень сухо подано. Есть примеры но без описания. Коррелированный подзапрос так вообще как по мне так себе объяснен. Вот пример, где плюс минус расписано и доходчиво объяснено. https://sql-academy.org/ru/guide/correlated-subqueries ","creator":{"public_name":"Руслан Гребенюков","id":780656,"is_tutor":false},"comments":[{"creator":{"public_name":"Ivan Mamtsev","id":294764,"is_tutor":true},"id":195481,"body":"Добрый день, спасибо за замечание. Подумаем как мы можем улучшить теорию.","topic_id":103040}],"communitable":{"parent_entity_name":null,"parent_entity_url":null,"entity_name":"Подзапрос","entity_url":null,"active":true}}],"lesson":{"exercise":{"id":2418,"slug":"complex_sql_queries_subquery_exercise","name":null,"state":"active","kind":"exercise","language":"sql","locale":"ru","has_web_view":false,"has_test_view":false,"reviewable":true,"readme":"В таблице `employees` хранятся данные о сотрудниках:\n\n**employees**\n\n| id | name | department_id | jobtitle | salary |\n|----|------------|---------------|----------|--------|\n| 1 | Employee 1 | 10 | Title 1 | 100 |\n| 2 | Employee 2 | 2 | Title 2 | 400 |\n| 3 | Employee 3 | 15 | Title 3 | 200 |\n\n## solution.sql\n\nСоставьте запрос, который выводит поля `name`, `jobtitle` и `salary` для сотрудников, значение `salary` которых больше среднего по всей таблице.\n\n### Подсказки\n\n* Перед тем, как писать запросы в файл, можно зайти в репл `psql` в терминале и поэкспериментировать\n* [AVG()](https://ru.hexlet.io/courses/rdb-basics/lessons/functions/theory_unit)\n","prepared_readme":"В таблице `employees` хранятся данные о сотрудниках:\n\n**employees**\n\n| id | name | department_id | jobtitle | salary |\n|----|------------|---------------|----------|--------|\n| 1 | Employee 1 | 10 | Title 1 | 100 |\n| 2 | Employee 2 | 2 | Title 2 | 400 |\n| 3 | Employee 3 | 15 | Title 3 | 200 |\n\n## solution.sql\n\nСоставьте запрос, который выводит поля `name`, `jobtitle` и `salary` для сотрудников, значение `salary` которых больше среднего по всей таблице.\n\n### Подсказки\n\n* Перед тем, как писать запросы в файл, можно зайти в репл `psql` в терминале и поэкспериментировать\n* [AVG()](https://ru.hexlet.io/courses/rdb-basics/lessons/functions/theory_unit)\n","has_solution":true,"entity_name":"Подзапрос"},"units":[{"id":8329,"name":"theory","url":"/courses/complex-sql-queries/lessons/subquery/theory_unit"},{"id":9734,"name":"quiz","url":"/courses/complex-sql-queries/lessons/subquery/quiz_unit"},{"id":8337,"name":"exercise","url":"/courses/complex-sql-queries/lessons/subquery/exercise_unit"}],"links":[],"ordered_units":[{"id":8329,"name":"theory","url":"/courses/complex-sql-queries/lessons/subquery/theory_unit"},{"id":9734,"name":"quiz","url":"/courses/complex-sql-queries/lessons/subquery/quiz_unit"},{"id":8337,"name":"exercise","url":"/courses/complex-sql-queries/lessons/subquery/exercise_unit"}],"id":3691,"slug":"subquery","state":"approved","name":"Подзапрос","course_order":130,"goal":"Разбираемся, как делать вычисления над таблицей в несколько уровней","self_study":null,"theory_video_provider":"vimeo","theory_video_uid":"833640300","theory":"Подзапрос `SQL` - это запрос, который включается в другой запрос. Подзапросы позволяют использовать результат выполнения внутреннего запроса во внешнем запросе, что позволяет строить сложные запросы из более простых.\n\n\n\n## Применение подзапросов\n\nПодзапросы могут применяться практически везде, в любых операторах, в том числе в операторах `DDL`, `DML`.\n\nРассмотрим таблицу _products_:\n\n**products**\n\n| id | product_name | price |\n| --- | --- | --- |\n| 10928473 | Стиральная машина Electrolux | 28499.99 |\n| 20483739 | Беспроводные наушники JBL с микрофоном | 4999.0 |\n| 73648393 | Игровая мышь Acer | 1099.0 |\n| ... | ... | ... |\n\nПример подзапроса, который выводит все продукты, цена которых выше средней по всем продуктам:\n\n```sql\nSELECT *\nFROM products\nWHERE price > (SELECT AVG(price) FROM products);\n```\n\nВ результате мы получим такую таблицу:\n\n**products**\n\n| id | product_name | price |\n| --- | --- | --- |\n| 10928473 | Стиральная машина Electrolux | 28499.99 |\n| 66379812 | Ноутбук Dell | 90299.0 |\n| 33801167 | Ноутбук Acer | 53849.0 |\n| 99842651 | Электровелосипед HIPER | 19999.0 |\n\n[Таблица на DB Fiddle](https://www.db-fiddle.com/f/kixjUrx1JN9QA34tjdUpc2/1)\n\nПример подзапроса, который выводит все продукты, которые есть в таблице с чеками:\n\n```sql\nSELECT *\nFROM products\nWHERE\n id IN\n (SELECT product_id FROM sales);\n```\n\nРезультат будет следующим:\n\n**products**\n\n| id | product_name | price |\n| --- | --- | --- |\n| 10928473 | Стиральная машина Electrolux | 28499.99 |\n| 20483739 | Беспроводные наушники JBL с микрофоном | 4999.0 |\n| 73648393 | Игровая мышь Acer | 1099.0 |\n| 17728904 | Компьютерная мышь Logitech | 650.0 |\n\n[Таблица на DB Fiddle](https://www.db-fiddle.com/f/kixjUrx1JN9QA34tjdUpc2/2)\n\n## ALL/ANY (MySQL)\n\n| ALL | ANY |\n| --- | --- |\n| x > ALL (1, 2) эквивалентно x > 2 | x > ANY (1, 2) эквивалентно x > 1 |\n| x < ALL (1, 2) эквивалентно x < 1 | x < ANY (1, 2) эквивалентно x < 2 |\n| x = ALL (1, 2) эквивалентно (x = 1) AND (x = 2) | x = ANY (1, 2) эквивалентно x IN (1, 2) |\n| x <> ALL (1, 2) эквивалентно x NOT IN (1, 2) | x <> ANY (1, 2) эквивалентно (x <> 1) OR (x <> 2) |\n\n## Подзапрос как новая колонка\n\nПодзапросы в SQL могут быть использованы для создания новых колонок в результирующем наборе данных.\n\nНовая колонка, созданная с помощью подзапроса, может содержать вычисленные значения, агрегатные функции или другие данные, основанные на значениях других столбцов в таблице\n\n```sql\nSELECT\n *,\n (\n SELECT product_name\n FROM products\n WHERE id = sales.product_id\n ) AS product\nFROM sales;\n```\n\nРезультат будет таким:\n\n**products**\n\n| product_id | sale_date | quantity | total_price | product |\n| --- | --- | --- | --- | --- |\n| 10928473 | 2023-03-08T00:00:00.000Z | 1 | 28500 | Стиральная машина Electrolux |\n| ... | ... | ... | ... | ... |\n| 10928473 | 2023-06-13T00:00:00.000Z | 5 | 142500 | Стиральная машина Electrolux |\n\n[Таблица на DB Fiddle](https://www.db-fiddle.com/f/kixjUrx1JN9QA34tjdUpc2/3)\n\n## Подзапросы в UPDATE\n\nОдно из основных применений подзапросов в операции `UPDATE` - это обновление значений столбца на основе вычисленных или фильтрованных данных из других таблиц или столбцов.\n\n```sql\nUPDATE sales\nSET\n price = (\n SELECT products.price\n FROM products\n WHERE products.id = sales.product_id\n ) + 3000\nWHERE id = 1;\n```\n\n[Таблица на DB Fiddle](https://www.db-fiddle.com/f/kixjUrx1JN9QA34tjdUpc2/5)\n\n## Подзапросы в INSERT\n\nПодзапросы в операции `INSERT` используются для вставки данных, полученных из других таблиц или вычисленных с помощью подзапросов.\n\n```sql\nINSERT INTO sales (product_id, sale_date, quantity, total_price)\nVALUES\n(\n (SELECT id FROM products WHERE product_name = 'Фен Vitek'),\n '2018-05-23',\n 2,\n (SELECT price FROM products WHERE product_name = 'Фен Vitek')\n);\n```\n\n[Таблица на DB Fiddle](https://www.db-fiddle.com/f/kixjUrx1JN9QA34tjdUpc2/6)\n\n## Подзапросы в DELETE\n\nПодзапросы в операции `DELETE` позволяют удалить данные из таблицы на основе результатов других запросов или данных из других таблиц.\n\n```sql\nDELETE FROM sales\nWHERE product_id = (\n SELECT id\n FROM products\n WHERE product_name = 'Игровая мышь Acer'\n);\n```\n\n[Таблица на DB Fiddle](https://www.db-fiddle.com/f/kixjUrx1JN9QA34tjdUpc2/7)\n\n## Коррелированный подзапрос\n\nКоррелированный подзапрос - это подзапрос, который зависит от внешнего запроса и использует значения из внешнего запроса в своем выражении или фильтре.\n\nОсновное применение коррелированных подзапросов - это выполнение операций, связанных с каждой строкой основного запроса. Коррелированные подзапросы выполняются для каждой строки внешнего запроса и используют значения из этой строки для фильтрации или вычисления данных в подзапросе.\n\n```sql\nSELECT *\nFROM product_price AS pp\nWHERE\n pp.price = (\n SELECT min(ppm.price)\n FROM product_price AS ppm\n WHERE ppm.product_id = pp.product_id\n )\nORDER BY pp.product_id, pp.price, pp.store_id\n```\n\n**products**\n\n| product_id | store_id | price |\n| --- | --- | --- |\n| 10928473 | 1 | 28499.99 |\n| 17728904 | 1 | 650.00 |\n| 20483739 | 1 | 4999.00 |\n| 73648393 | 1 | 1099.00 |\n\n[Таблица на DB Fiddle](https://www.db-fiddle.com/f/kixjUrx1JN9QA34tjdUpc2/8)\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. Знания из этого курса помогут производить несколько уровней вычислений над таблицей, а также использовать сложные формулы с переиспользованием предыдущих шагов.","kind":"advanced","updated_at":"2026-01-20T11:45:01.045Z","language":"sql","duration_cache":25140,"skills":["Писать сложные вложенные SQL-запросы","Использовать оконные функции в SQL","Работать с накопительной агрегацией"],"keywords":[],"lessons_count":6,"cover":"https://hexlet.io/rails/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NzE1OCwicHVyIjoiYmxvYl9pZCJ9fQ==--2d20c480f2ff423e7f6e673bd7246911c3929f64/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJwbmciLCJyZXNpemVfdG9fZmlsbCI6WzYwMCw0MDBdfSwicHVyIjoidmFyaWF0aW9uIn19--6067466c2912ca31a17eddee04b8cf2a38c6ad17/image.png"},"recommendedLandings":[{"stack":{"id":55,"slug":"data-analytics","title":"Аналитик 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__m__-_R_rdub_"><style data-mantine-styles="inline">.__m__-_R_6qrdub_{margin-top:0rem;padding-inline:var(--mantine-spacing-xs);width:100%;}@media(min-width: 48em){.__m__-_R_6qrdub_{margin-top:var(--mantine-spacing-xl);width:80%;}}@media(min-width: 62em){.__m__-_R_6qrdub_{padding-inline:var(--mantine-spacing-xl);}}</style><div style="margin-inline:auto;max-width:var(--mantine-breakpoint-xl)" class="__m__-_R_6qrdub_"><div style="color:var(--mantine-color-dimmed)" class="m_4451eb3a mantine-Center-root" data-inline="true"><div style="--ti-size:var(--ti-size-xs);--ti-bg:transparent;--ti-color:var(--mantine-color-indigo-light-color);--ti-bd:calc(0.0625rem * var(--mantine-scale)) solid transparent;margin-inline-end:calc(0.125rem * var(--mantine-scale));color:inherit" class="m_7341320d mantine-ThemeIcon-root" data-variant="transparent" data-size="xs"><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-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: Подзапрос</h1><script type="application/ld+json">{"@context":"https://schema.org","@type":"LearningResource","name":"Подзапрос","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>Подзапрос <code style="margin-bottom:var(--mantine-spacing-lg)" class="m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight m_e597c321 mantine-CodeHighlight-codeHighlight m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight">SQL</code> - это запрос, который включается в другой запрос. Подзапросы позволяют использовать результат выполнения внутреннего запроса во внешнем запросе, что позволяет строить сложные запросы из более простых.</p>
<p><img style="--image-object-fit:contain;width:auto" class="m_9e117634 mantine-Image-root" src="/rails/active_storage/blobs/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NzIwNSwicHVyIjoiYmxvYl9pZCJ9fQ==--e5f86574b61fbc7ab61a6ca8e0c66ecfe81d41a3/subquery.png" alt="Подзапрос SQL" loading="lazy"/></p>
<h2 id="heading-2-1">Применение подзапросов</h2>
<p>Подзапросы могут применяться практически везде, в любых операторах, в том числе в операторах <code style="margin-bottom:var(--mantine-spacing-lg)" class="m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight m_e597c321 mantine-CodeHighlight-codeHighlight m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight">DDL</code>, <code style="margin-bottom:var(--mantine-spacing-lg)" class="m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight m_e597c321 mantine-CodeHighlight-codeHighlight m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight">DML</code>.</p>
<p>Рассмотрим таблицу <em>products</em>:</p>
<p><strong>products</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>product_name</th><th>price</th></tr></thead><tbody><tr><td>10928473</td><td>Стиральная машина Electrolux</td><td>28499.99</td></tr><tr><td>20483739</td><td>Беспроводные наушники JBL с микрофоном</td><td>4999.0</td></tr><tr><td>73648393</td><td>Игровая мышь Acer</td><td>1099.0</td></tr><tr><td>...</td><td>...</td><td>...</td></tr></tbody></table></div></div></div></div>
<p>Пример подзапроса, который выводит все продукты, цена которых выше средней по всем продуктам:</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">SELECT *
FROM products
WHERE price > (SELECT AVG(price) FROM products);</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>В результате мы получим такую таблицу:</p>
<p><strong>products</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>product_name</th><th>price</th></tr></thead><tbody><tr><td>10928473</td><td>Стиральная машина Electrolux</td><td>28499.99</td></tr><tr><td>66379812</td><td>Ноутбук Dell</td><td>90299.0</td></tr><tr><td>33801167</td><td>Ноутбук Acer</td><td>53849.0</td></tr><tr><td>99842651</td><td>Электровелосипед HIPER</td><td>19999.0</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/kixjUrx1JN9QA34tjdUpc2/1" rel="noopener noreferrer" target="_blank">Таблица на DB Fiddle</a></p>
<p>Пример подзапроса, который выводит все продукты, которые есть в таблице с чеками:</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">SELECT *
FROM products
WHERE
id IN
(SELECT product_id FROM sales);</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>Результат будет следующим:</p>
<p><strong>products</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>product_name</th><th>price</th></tr></thead><tbody><tr><td>10928473</td><td>Стиральная машина Electrolux</td><td>28499.99</td></tr><tr><td>20483739</td><td>Беспроводные наушники JBL с микрофоном</td><td>4999.0</td></tr><tr><td>73648393</td><td>Игровая мышь Acer</td><td>1099.0</td></tr><tr><td>17728904</td><td>Компьютерная мышь Logitech</td><td>650.0</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/kixjUrx1JN9QA34tjdUpc2/2" rel="noopener noreferrer" target="_blank">Таблица на DB Fiddle</a></p>
<h2 id="heading-2-2">ALL/ANY (MySQL)</h2>
<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>ALL</th><th>ANY</th></tr></thead><tbody><tr><td>x > ALL (1, 2) эквивалентно x > 2</td><td>x > ANY (1, 2) эквивалентно x > 1</td></tr><tr><td>x < ALL (1, 2) эквивалентно x < 1</td><td>x < ANY (1, 2) эквивалентно x < 2</td></tr><tr><td>x = ALL (1, 2) эквивалентно (x = 1) AND (x = 2)</td><td>x = ANY (1, 2) эквивалентно x IN (1, 2)</td></tr><tr><td>x <> ALL (1, 2) эквивалентно x NOT IN (1, 2)</td><td>x <> ANY (1, 2) эквивалентно (x <> 1) OR (x <> 2)</td></tr></tbody></table></div></div></div></div>
<h2 id="heading-2-3">Подзапрос как новая колонка</h2>
<p>Подзапросы в SQL могут быть использованы для создания новых колонок в результирующем наборе данных.</p>
<p>Новая колонка, созданная с помощью подзапроса, может содержать вычисленные значения, агрегатные функции или другие данные, основанные на значениях других столбцов в таблице</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">SELECT
*,
(
SELECT product_name
FROM products
WHERE id = sales.product_id
) AS product
FROM sales;</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>Результат будет таким:</p>
<p><strong>products</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>product_id</th><th>sale_date</th><th>quantity</th><th>total_price</th><th>product</th></tr></thead><tbody><tr><td>10928473</td><td>2023-03-08T00:00<div></div>.000Z</td><td>1</td><td>28500</td><td>Стиральная машина Electrolux</td></tr><tr><td>...</td><td>...</td><td>...</td><td>...</td><td>...</td></tr><tr><td>10928473</td><td>2023-06-13T00:00<div></div>.000Z</td><td>5</td><td>142500</td><td>Стиральная машина Electrolux</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/kixjUrx1JN9QA34tjdUpc2/3" rel="noopener noreferrer" target="_blank">Таблица на DB Fiddle</a></p>
<h2 id="heading-2-4">Подзапросы в UPDATE</h2>
<p>Одно из основных применений подзапросов в операции <code style="margin-bottom:var(--mantine-spacing-lg)" class="m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight m_e597c321 mantine-CodeHighlight-codeHighlight m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight">UPDATE</code> - это обновление значений столбца на основе вычисленных или фильтрованных данных из других таблиц или столбцов.</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">UPDATE sales
SET
price = (
SELECT products.price
FROM products
WHERE products.id = sales.product_id
) + 3000
WHERE id = 1;</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><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/kixjUrx1JN9QA34tjdUpc2/5" rel="noopener noreferrer" target="_blank">Таблица на DB Fiddle</a></p>
<h2 id="heading-2-5">Подзапросы в INSERT</h2>
<p>Подзапросы в операции <code style="margin-bottom:var(--mantine-spacing-lg)" class="m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight m_e597c321 mantine-CodeHighlight-codeHighlight m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight">INSERT</code> используются для вставки данных, полученных из других таблиц или вычисленных с помощью подзапросов.</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">INSERT INTO sales (product_id, sale_date, quantity, total_price)
VALUES
(
(SELECT id FROM products WHERE product_name = 'Фен Vitek'),
'2018-05-23',
2,
(SELECT price FROM products WHERE product_name = 'Фен Vitek')
);</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><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/kixjUrx1JN9QA34tjdUpc2/6" rel="noopener noreferrer" target="_blank">Таблица на DB Fiddle</a></p>
<h2 id="heading-2-6">Подзапросы в DELETE</h2>
<p>Подзапросы в операции <code style="margin-bottom:var(--mantine-spacing-lg)" class="m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight m_e597c321 mantine-CodeHighlight-codeHighlight m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight">DELETE</code> позволяют удалить данные из таблицы на основе результатов других запросов или данных из других таблиц.</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">DELETE FROM sales
WHERE product_id = (
SELECT id
FROM products
WHERE product_name = 'Игровая мышь Acer'
);</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><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/kixjUrx1JN9QA34tjdUpc2/7" rel="noopener noreferrer" target="_blank">Таблица на DB Fiddle</a></p>
<h2 id="heading-2-7">Коррелированный подзапрос</h2>
<p>Коррелированный подзапрос - это подзапрос, который зависит от внешнего запроса и использует значения из внешнего запроса в своем выражении или фильтре.</p>
<p>Основное применение коррелированных подзапросов - это выполнение операций, связанных с каждой строкой основного запроса. Коррелированные подзапросы выполняются для каждой строки внешнего запроса и используют значения из этой строки для фильтрации или вычисления данных в подзапросе.</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">SELECT *
FROM product_price AS pp
WHERE
pp.price = (
SELECT min(ppm.price)
FROM product_price AS ppm
WHERE ppm.product_id = pp.product_id
)
ORDER BY pp.product_id, pp.price, pp.store_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>products</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>product_id</th><th>store_id</th><th>price</th></tr></thead><tbody><tr><td>10928473</td><td>1</td><td>28499.99</td></tr><tr><td>17728904</td><td>1</td><td>650.00</td></tr><tr><td>20483739</td><td>1</td><td>4999.00</td></tr><tr><td>73648393</td><td>1</td><td>1099.00</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/kixjUrx1JN9QA34tjdUpc2/8" rel="noopener noreferrer" target="_blank">Таблица на DB Fiddle</a></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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