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
答案:
SELECT title,AVG(s.salary) as a from titles t INNER JOIN salaries s WHERE t.emp_no=s.emp_no GROUP BY title ORDER BY a asc
按title分组，计算平均工资并且按平均工资排序
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