Шпаргалки для айтишников | United States America (US)

Create: 2023-12-13 Update: 2025-07-08 23:59:28

Как работают SQL-соединения? На диаграмме ниже подробно показано, как работают 4 типа SQL-соединений.

🔹INNER JOIN Возвращает совпадающие строки в обеих таблицах.

🔹LEFT JOIN Возвращает все записи из левой таблицы и соответствующие записи из правой таблицы.

🔹RIGHT JOIN Возвращает все записи из правой таблицы и соответствующие записи из левой таблицы.

🔹FULL OUTER JOIN Возвращает все записи, в которых есть совпадения, в левой или правой таблице.

Шпаргалки для айтишников

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Шпаргалки для айтишников

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Как работают SQL-соединения? На диаграмме ниже подробно показано

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