43 - 部门工资前三高的所有员工

# dense_rank 排名selectDepartment,Employee,Salary
from(selectd.name as Department,e.name as Employee,e.salary as Salary,(dense_rank() over (partition by d.name order by e.salary desc)) as rankingfrom Employee e left join Department d on e.departmentId=d.id) as t
where ranking<=3;