数据库:184. 部门工资最高的员工

数据库: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 |
±-----------±---------±-------+

# Write your MySQL query statement below
select Department.Name as Department , Employee.Name as Employee , Employee.Salary as Salary  from Department , Employee , (select DepartmentId , max(Salary) as Salary from Employee group by DepartmentId  ) as salary where  Department.id = Employee.DepartmentId and salary.Salary = Employee.Salary and  Employee.DepartmentId = salary.DepartmentId;