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
select tt.title,avg(sal.salary) avg_sal from titles as tt left join salaries as sal on tt.emp_no = sal.emp_no group by tt.title order by avg_sal
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