Question

SQL DELAd在PHPmyAdmin中崩溃。无法解决原因;是因为LEFT OUTER JOIN？

SELECT * 
  FROM `User` 
LEFT OUTER JOIN `freshersdata` ON `User`.`username`=`freshersdata`.`username` 
 WHERE (`freshersdata`.`username` IS null) 
   AND (`User`.`Persistent`!=1)

这个SQL查询正在崩溃（＃1064 - 你的SQL语法中有错误;）但是完全可以使用SELECT而不是删除，为什么会这样？

Answer 1

您必须指定要从哪个表中删除：

例如来自用户：

DELETE User.* 
  FROM User 
LEFT OUTER JOIN freshersdata ON User.username=freshersdata.username 
 WHERE (freshersdata.username IS null) AND (User.Persistent!=1)

Answer 2

DELETE FROM User 
LEFT OUTER JOIN 
   freshersdata ON User.username=freshersdata.username  
WHERE (freshersdata.username IS null) AND (User.Persistent!=1)

SQL DELETE在PHPmyAdmin中崩溃

2 个答案: