题解 | #统计出当前各个title类型对应的员工当前薪水对应的平均工资#
统计出当前各个title类型对应的员工当前薪水对应的平均工资
http://www.nowcoder.com/practice/c8652e9e5a354b879e2a244200f1eaae
答案如下：
SELECT
title,avg(s.salary)
FROM (
SELECT
title
,salary
FROM titles t
JOIN salaries sa
on t.emp_no=sa.emp_no
) s
GROUP by title
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