mysql - 可以在 SQL 删除查询中使用别名吗？

Question

我有以下 SQL 查询:

DELETE FROM table_b b WHERE NOT EXISTS (SELECT * FROM table_a a WHERE a.some_id = b.some_id)

出现以下错误:

[Err] 1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'b WHERE NOT EXISTS(SELECT * FROM table_a a WHERE a.some_id = b.some_id)' at line 1

这似乎表明别名不能与 SQL 删除语句一起使用(？)

Answer 1

是的，您可以在DELETE 查询中使用别名。只要你在 DELETE 关键字之后使用那个别名就可以了。它指定从哪个表中删除记录。

试试这个:

DELETE b 
FROM table_b b
WHERE NOT EXISTS (SELECT * FROM table_a a WHERE a.some_id = b.some_id)