[Err] 1248 - Every derived table must have its own alias(MySQL报错)

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在另一篇MySQL报错的文章 [Err] 1093 - You can't specify target table 'a' for update in FROM clause (MYSQL报错) 中提到了要将查询结果作为一个表来进行一次select查询

代码如下

update archives a, sys_user s 
set s.username = a.stu_name 
where s.id = a.id and a.phone IN (select * from (select a.phone
				    from archives a, sys_user s
				    where a.phone = s.mobile
				    GROUP BY a.phone
				    HAVING COUNT(*) > 1)) 

和最终的正确代码相比

update archives a, sys_user s 
set s.username = a.stu_name 
where s.id = a.id and a.phone IN (select * from (select a.phone
						from archives a, sys_user s
						where a.phone = s.mobile
						GROUP BY a.phone
						HAVING COUNT(*) > 1) k) 

缺少了最后将查询结果命名为表k的过程

所以产生了错误[Err] 1248 - Every derived table must have its own alias

解决方法也很简单，就像上边提到的对查询结果进行一个表命名就可以了。

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