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 t.title, avg(s.salary) AS average
FROM titles t
JOIN salaries s
USING (emp_no)
GROUP BY t.title
ORDER BY average
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