题解 | #考试分数(一)#
考试分数(一)
http://www.nowcoder.com/practice/f41b94b4efce4b76b27dd36433abe398
先按照job 分组然后统计每个分组的求和除以统计个数、然后保留小数3位。再按照平均分排序
-- select job|avg(1.0*score) from grade group by job ;
select job , round((1.0*sum(score)/count(id) ),3) as a from grade group by job order by a desc ;
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