Question

我有两个相互关联的表，我想只从一个表中删除记录。表格结构如下

Table : Users
userunique, active, unSubscribed

Table : userBilling
userunique, billCreatedDate,billstatus

我想删除那些不再具有以下条件的用户的帐单。

billcreateddate < 2011-12-30 
billstatus=2 //pending

active='0'
unSubscribed<'2011-12-30'

我写了一个查询，但这不是我的预期。我想仅从userBilling表而不是用户表

中删除记录

select * from userBilling ubill, Users user
WHERE ubilll.userUnique=user.userUnique 
AND ubill.billCreatedDate<'2011-12-30'
AND ubill.billstatus = '2'  
AND ((user.active = '0') AND (user.unsubscribed>'2011-01-01') 
AND user.unSubscribed<'2011-12-30'))

但我猜上面的查询包括两个表的结果。请提出建议！

谢谢，

Answer 1

DELETE  a
FROM    userBilling a
        INNER JOIN users b
            ON a.auserUnique = b.userUnique
WHERE   billcreateddate < 2011-12-30 OR
        billstatus = 2 OR
        active = 0 OR
        unSubscribed < '2011-12-30'

如果您希望所有条件为真 ，请将OR更改为AND。

Answer 2

这应该有效。你应该总是明确地加入你的联接。那样你就不会感到惊讶了。

DELETE ubill
FROM userBilling ubill
  JOIN Users u
  ON (ubill.userUnique=u.userUnique)
WHERE ubill.billCreatedDate<'2011-12-30'
  AND ubill.billstatus = '2'  
  AND ((u.active = '0') AND (u.unsubscribed>'2011-01-01') 
  AND u.unSubscribed<'2011-12-30'))

Answer 3

尝试这样做

     DELETE ubill
      FROM userBilling ubill
     INNER JOIN Users
     ON  ubill.userUnique=user.userUnique
      WHERE  
        ubill.billCreatedDate<'2011-12-30'
        AND ubill.billstatus = '2'  
        AND user.active = '0' 
        AND user.unsubscribed>'2011-01-01' 
        AND user.unSubscribed<'2011-12-30'

MySQL仅从单表中删除记录

3 个答案: