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SQL для тестировщика@sql_for_qa P.895
SQL_FOR_QA Telegram 895
Какое из утверждений о FOREIGN KEY в PostgreSQL неверно?
Anonymous Quiz
Внешний ключ обеспечивает ссылочную целостность между таблицами
Внешний ключ может ссылаться только на уникальный или первичный ключ другой таблицы
Внешний ключ может ссылаться на несуществующую таблицу
При удалении родительской записи можно настроить каскадное удаление дочерних записей
Внешний ключ можно добавить к существующей таблице с помощью ALTER TABLE
Внешний ключ может быть составным (несколько столбцов)
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