leetcode184. 部門工資最高的員工
Employee 表包含所有員工資訊，每個員工有其對應的 Id, salary 和 department Id。
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| Id | Name | Salary | DepartmentId |
±—±------±-------±-------------+
| 1 | Joe | 70000 | 1 |
| 2 | Henry | 80000 | 2 |
| 3 | Sam | 60000 | 2 |
| 4 | Max | 90000 | 1 |
±—±------±-------±-------------+
Department 表包含公司所有部門的資訊。
±—±---------+
| Id | Name |
±—±---------+
| 1 | IT |
| 2 | Sales |
±—±---------+
編寫一個 SQL 查詢，找出每個部門工資最高的員工。例如，根據上述給定的表格，Max 在 IT 部門有最高工資，Henry 在 Sales 部門有最高工資。
±-----------±---------±-------+
| 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 )