题解 | #获取每个部门中当前员工薪水最高的相关信息#

with 
deptsalary as
(select
d.dept_no,
max(s.salary) as maxSalary
from dept_emp d
left join salaries s on s.emp_no=d.emp_no
group by d.dept_no)
select
ds.dept_no,
s.emp_no,
ds.maxSalary
from salaries s
join deptsalary ds on s.salary=ds.maxSalary
join dept_emp de on de.emp_no=s.emp_no
where ds.dept_no=de.dept_no
order by ds.dept_no;

需要额外联查判断dept_no和emp_no是否是正确对应