Question

嘿伙计们我想要这样的事情：

DELETE FROM ClientsFlags 
WHERE clientId = (SELECT id 
                  FROM Client 
                  WHERE emailRegistrationToken = 3) 
AND flagId = 42;

但是使用连接而不是子查询。我对加入不是很好，所以请帮助我。

Answer 1

这是一个加入版本，

DELETE  a
FROM    ClientsFlags a
        INNER JOIN Client b
            ON a.clientId = b.id
WHERE   b.emailRegistrationToken = 3 AND            
        a.flagId = 42;

Answer 2

试试这个

Delete C From ClientFlags cf, Client c where cf.lientId=c.Id and email=3 and flagId=42;

Answer 3

你应该尝试这样的事情：

 DELETE C FROM ClientsFlags AS CF
 JOIN Client AS C ON C.Id=CF.clientId 
 WHERE email=3 and flagId=42

MySQL加入而不是子查询

3 个答案: