题解 | #获取每个部门中当前员工薪水最高的相关信息#

请教一下各位大佬，这样做有没有漏洞，自己看有点看不出来

select em.dept_no, em.emp_no, sa.salary maxSalary
from dept_emp em
join salaries sa on em.emp_no =sa.emp_no
where (em.dept_no,sa.salary) in 
(
    select em.dept_no,MAX(sa.salary)
    from dept_emp em
    join salaries sa on em.emp_no =sa.emp_no
    group by em.dept_no
    having em.to_date = '9999-01-01'
) 
order by em.dept_no