题解 | #获取每个部门中当前员工薪水最高的相关信息#

用开窗函数解决，外面套一层限制只要每个部门最高薪水员工的信息

select dept_no,emp_no,salary as maxSalary
from
    (select emp.dept_no, 
        emp.emp_no, 
        sal.salary,
        row_number() over(partition by emp.dept_no order by sal.salary desc) as pay_number
    from dept_emp emp left join salaries sal
    on emp.emp_no = sal.emp_no) tmp
where pay_number = 1;