Mysql 子查询 出现 Every derived table must have its own alias 错误
2017-03-16 19:55
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1.新建如下一张表（deptno–部门编号，sal–薪水）
2.求每个部门的平均薪水
3.求最大的平均薪水值以及对应的部门号
出现了 Every derived table must have its own alias 错误
分析：alias是别名的意思，整个错误：每一张派生表必须有自己的名字
也就是说没有给派生表起名，再做个修改即可
4.修改之后
5.使用视图将语句简化
视图，本质上是一种虚拟表，是由基本表（实表）产生的虚表，并不以存储数据值的形式存在。
6.将平均薪水最高的部门编号输出
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