题解 | #获取每个部门中当前员工薪水最高的相关信息#
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 x.dept_no, x.emp_no, x.salary as maxSalary FROM (SELECT de.dept_no, de.emp_no, s.salary, row_number()over(partition by de.dept_no order by s.salary desc)as mm from dept_emp de LEFT JOIN salaries s on s.emp_no = de.emp_no)x where x.mm =1 order by x.dept_no