工资表，项目表，每个项目平均工资
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
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select title, avg(salary) from salaries, titles where salaries.to_date='9999-01-01' and titles.to_date='9999-01-01' and salaries.emp_no=titles.emp_no group by titles.title;
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