题解 | 当前各个title类型对应的员工当前薪水的平均工资
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
https://www.nowcoder.com/practice/c8652e9e5a354b879e2a244200f1eaae
select
title,avg(salary)
from (
select
b.emp_no,b.salary,a.title
from titles a
left join salaries b
on a.emp_no = b.emp_no
)h
group by title
order by avg(salary)
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