mysql课后作业 统计各部门的薪水总和怎么做

Posted 2023-05-07

参考技术A mysql分组查询group by

select sum(薪水) from 表 group by 部门字段本回答被提问者采纳

查询各部门中高于部门平均工资的人员,人数及该部门的平均工资

先通过查询得到平均工资表，然后在联结查询平均工资表和员工表，Group by修饰count(*)，Group by要在where子句之后，order by子句之前。

select a.*,avgsal,count(*) as number
from emp as a,(select deptno,avg(salary) as avgsal from emp group by deptno) as b
where a.deptno=b.deptno and a.salary>b.avgsal
group by a.deptno
order by a.deptno;