题解 | =使用rank（）分区函数
获取每个部门中当前员工薪水最高的相关信息
https://www.nowcoder.com/practice/4a052e3e1df5435880d4353eb18a91c6
with a as (
select d.dept_no, s.emp_no, s.salary
from dept_emp d inner join salaries s
on d.emp_no = s.emp_no
),
b as (
select dept_no, emp_no, salary, rank() over (partition by dept_no order by salary desc) as r
from a
)
select dept_no, emp_no, salary from b
where r = 1
select d.dept_no, s.emp_no, s.salary
from dept_emp d inner join salaries s
on d.emp_no = s.emp_no
),
b as (
select dept_no, emp_no, salary, rank() over (partition by dept_no order by salary desc) as r
from a
)
select dept_no, emp_no, salary from b
where r = 1
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