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
https://www.nowcoder.com/practice/c8652e9e5a354b879e2a244200f1eaae
select title, avg(s.salary) from( select t1.emp_no, t1.title, t2.salary from titles as t1 inner join salaries as t2 on t1.emp_no = t2.emp_no) as s group by title