题解 | #获取每个部门中当前员工薪水最高的相关信息#

select c.dept_no,c.emp_no,c.salary max_Salary
from
    (select dept_no,a.emp_no,b.salary,
    RANK() over (partition by dept_no order by salary desc) r
    from dept_emp a,salaries b
    where a.emp_no=b.emp_no and a.from_date<=b.from_date and a.to_date>=b.to_date) c
where r=1