数据库SQL实战 No.16
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/questionTerminal/c8652e9e5a354b879e2a244200f1eaae
SELECT title, avg(salary) as average
FROM titles t join salaries s on t.emp_no = s.emp_no
WHERE t.to_date = '9999-01-01'
AND s.to_date = '9999-01-01'
GROUP BY t.title
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