MySQL：从IN中删除

Question

我知道这是一个简单的语法问题。试图从一个子查询中删除所有用户：

delete from users 
where id IN (

select u.id 
from users u 
where not exists (select * from stickies i where i.user_id = u.id) 
group by u.email 
having count(*) > 1 

) 

收到此错误：

error : You can't specify target table 'users' for update in FROM clause 

子查询工作正常（用户ID的回报清单）。

Answer 1

DELETE u.* 
FROM users u JOIN (
    SELECT u.id 
    FROM users u LEFT JOIN stickies i ON i.user_id = u.id 
    WHERE i.user_id IS NULL 
    GROUP BY u.email 
    HAVING COUNT(*) > 1 
) r ON r.id = r.id 

注意：在内部查询中，您是通过电子邮件进行分组，但选择了用户标识。这可能会返回非确定性结果。