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
两表联查,以title 进行分组 最后去重
select distinct title,avg(salary)
from titles join salaries using(emp_no)
group by title;