having分组后二次筛选

1.统计各个岗位的平均工资

select deptno,avg(sal) from emp group by deptno having avg(sal)>2000;

运行结果：

 

 也可给avg(sal)取个名字，后面也用名字替换，运行结果一样。

select deptno,avg(sal) 平均工资 from emp group by deptno having 平均工资 >2000;

运行结果：

 

也可以升降序：

select deptno,avg(sal) 平均工资 from emp group by deptno having 平均工资 >2000 order by deptno desc;

 

 

2.统计各个岗位的平均工资,除了MANAGER

方法1：

select job,avg(sal) from emp where job != 'MANAGER' group by job ;

运行结果：

 

 方法2：

select job,avg(sal)from emp group by job having job != 'MANAGR';

运行结果：