SQL哪里：最好使用靜態數組或選擇？

Question

我有一個MySQL數據庫，需要刪除表father的某些條目，但是在表father和child表之間有一些FK的限制，為此，我必須從child表中刪除，然后從表中刪除father桌。 我有：

DELETE FROM child WHERE child.id IN (SELECT id FROM father);

我想知道，如果我使用過，它是否會有性能變化（除了額外的選擇）

DELETE FROM child WHERE child.id IN (1,2,...,n)

1,2 ... n的結果與“從父親選擇ID”的結果相同。

Answer 1

使用多表DELETE比任何一種都快：

DELETE FROM child
    USING father JOIN child 
        ON child.id = father.id;

不應該是child.father_id嗎？ 不，那似乎是錯誤的？？

這似乎更接近您的英語：

DELETE FROM child
    USING father JOIN child 
        ON child.father_id = father.id   -- more likely FK
    WHERE father...;   -- picking the Dads in question
DELETE FROM father
    WHERE father...;   -- picking the Dads in question

ON DELETE CASCADE可能會更快。