MySql having语句

四.having子句

1.语法:

select 查询内容

        from 表名

        [where 条件]

        [group by 分组字段]

        [having 条件]

        [order by 字段名asc|desc]

select from --->where过滤--->group by --->having过滤

--  1.列如: 每个部门不同岗位人数，且人数大于2

select count(*) from emp where count(*)>2 group by deptno,job