50分问关于多表查询的问题
有类似下面这样两个表:
1.存储的是月工资和考核分数
userid monthpay monthscore
2.存储的是季奖金和考核分数
userid quarterpay quarterscore
现在,要把每个员工的工资总和,月平均考核分数,奖金总和,季平均考核分数统计出来
sql语句怎么写?
select a.userid,sum(a.monthpay),avg(a.monthscore),sum(b.quarterpay),avg(b.quarterscore) form ……
------解决方案--------------------select a.userid,sum(a.monthpay),avg(a.monthscore),sum(b.quarterpay),avg(b.quarterscore) form a,b where a,userid=b.userid
没有试过,不过应该可以 的.
------解决方案--------------------select *
from (
(select userid, sum(monthpay),avg(monthscore) from TabA group by userid) A
left join
(select userid, sum(quarterpay),avg(quarterscore) form TabB group by userid) B
on A.userid = B.userid
)
------解决方案--------------------楼上的可以了。楼主可能不太熟悉group by