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
考点：avg/group by
select t.title as title, avg(s.salary) from salaries s, titles t
where s.emp_no = t.emp_no
group by t.title
order by avg(s.salary) asc
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