leetcode184. 部门工资最高的员工

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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 | Henry | 80000 | 2 |
| 3 | Sam | 60000 | 2 |
| 4 | 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。例如，根据上述给定的表格，Max 在 IT 部门有最高工资，Henry 在 Sales 部门有最高工资。

±-----------±---------±-------+
| Department | Employee | Salary |
±-----------±---------±-------+
| IT | Max | 90000 |
| Sales | Henry | 80000 |

SELECT
Department.NAME AS Department,
Employee.NAME AS Employee,
Employee.Salary
FROM
Employee
JOIN Department ON Employee.DepartmentId = Department.Id
where (Employee.Salary,Employee.DepartmentId) in (SELECT MAX(Employee.Salary) as Salary,Employee.DepartmentId from Employee GROUP BY Employee.DepartmentId )