面試題：查詢部門最高工資的員工資訊
阿新 • • 發佈：2019-01-07
難度：中等
表Employee儲存了所有的員工資料。
| Id | Name | Salary | DepartmentId |
|---|---|---|---|
| 1 | Joe | 70000 | 1 |
| 2 | Henry | 80000 | 2 |
| 3 | Sam | 60000 | 2 |
| 4 | Max | 90000 | 1 |
表Department儲存了所有的部門資料。
| Id | Name |
|---|---|
| 1 | IT |
| 2 | Sales |
寫一段SQL查找出各部門工資最高的員工資訊。如上所示，IT部門工資最高的是Max，Sales部門工資最高的是Henry。
| Department | Employee | Salary |
|---|---|---|
| IT | Max | 90000 |
| Sales | Henry | 80000 |
- 答案一：
SELECT D.Nameas Department, E1.Name as Employee, E1.Salary as Salary
FROM Employee E1 join Department D
WHERE E1.DepartmentId = D.Id and E1.Salary >= (SELECT MAX(Salary) from Employee E2 WHERE E1.DepartmentId = E2.DepartmentId); - 答案二：
SELECT b.Nameas Department,a.nameas Employee, a.Salaryas Salary
FROM Employee a, Department b, (select max(Salary) as Salary, DepartmentId from Employee group by DepartmentId) c
WHERE a.DepartmentId = b.Id and a.Salary = c.Salary and a.DepartmentId = c.DepartmentId