题解 | #获取每个部门中当前员工薪水最高的相关信息#

用row_number排序取出最大值
select
    dept_no
    ,emp_no
    ,salary as maxSalary
from
(
    select dept_no,de.emp_no,salary
           ,row_number() over (partition by dept_no order by salary desc) as rk
    from dept_emp de 
         left join salaries s on de.emp_no = s.emp_no
) as a
where rk=1