184. 部门工资最高的员工

Employee 表包含所有员工信息，每个员工有其对应的 Id, salary 和 department Id。

+----+-------+--------+--------------+
| Id | Name | Salary | DepartmentId |
+----+-------+--------+--------------+
| 1 | Joe | 70000 | 1 |
| 2  | Jim   | 90000  | 1            |
| 3 | Henry | 80000 | 2 |
| 4 | Sam | 60000 | 2 |
| 5 | Max | 90000 | 1 |
+----+-------+--------+--------------+
Department 表包含公司所有部门的信息。

+----+----------+
| Id | Name |
+----+----------+
| 1 | IT |
| 2 | Sales |
+----+----------+
编写一个 SQL 查询，找出每个部门工资最高的员工。对于上述表，您的 SQL 查询应返回以下行（行的顺序无关紧要）。

+------------+----------+--------+
| Department | Employee | Salary |
+------------+----------+--------+
| IT | Max | 90000 |
| IT         | Jim      | 90000  |
| Sales | Henry | 80000 |
+------------+----------+--------+
解释：

Max 和 Jim 在 IT 部门的工资都是最高的，Henry 在销售部的工资最高。

来源：力扣（LeetCode）
链接：https://leetcode-cn.com/problems/department-highest-salary
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# Write your MySQL query statement below
select 
    d.Name as Department,
    e.Name as Employee,
    e.Salary 
from 
    Employee e,Department d 
where
    e.DepartmentId=d.id
    and
    (e.Salary,e.DepartmentId) in (select max(Salary),DepartmentId from Employee group by DepartmentId);