【mysql解决方案】ERROR 1248 (42000): Every derived table must have its own alias

简述

学习mysql的时候遇到了这个问题。
查了一下 https://stackoverflow.com/questions/3363918/mysql-error-1248-42000-every-derived-table-must-have-its-own-alias 这是stackoverflow的大佬给的解答。

其实是很简单的一个问题。

就是在多级查询的过程中，会需要给表一个别名。

代码

错误的查询方式：

select * from (select s.sno from student s where s.ssex='女');

正确的查询方式：

select * from (select s.sno from student s where s.ssex='女') as mid_sno;

其实区别，就在于背后有没有那个as mid_sno。

这是为了保证每个派生出来的表都需要有一个自己的别名。

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【mysql解决方案】ERROR 1248 (42000): Every derived table must have its own alias

简述

代码

【mysql解决方案】ERROR 1248 (42000): Every derived table must have its own alias相关推荐

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