题解 | #获取每个部门中当前员工薪水最高的相关信息#

select dept_no,emp_no,salary
from
(
    select a.emp_no,a.dept_no,salary,
    row_number() over (partition by dept_no order by salary desc) as rk
    from
    (
        select emp_no,dept_no
        from dept_emp
    )a left join 
    (
        select emp_no,salary
        from salaries
    )b on a.emp_no = b.emp_no
)t
where rk = 1
order by dept_no asc