您不能在FROM子句中为更新指定目标表'A'

Question

这是我的要求

> DELETE FROM A WHERE id in (    Select
> id From A    Left Join B on A.id=B.id 
> Where B.id is null )

执行此操作时出现此错误

  

您无法为目标表'A'指定   在FROM子句中更新

Answer 1

也许你可以这样做吗？

DELETE FROM A WHERE id NOT IN (SELECT DISTINCT B.id FROM B);

Answer 2

您想删除表A中表B中没有匹配ID的所有记录吗？

这个怎么样：

DELETE
FROM A
WHERE NOT EXISTS (select 1 from B where A.id = B.id);

Answer 3

DELETE FROM A
WHERE NOT EXISTS (
    SELECT *
    FROM B
    WHERE content_id = B.content_id
)