MySQL基礎系列--常用操作

查詢部門最高工資的員工信息

其他網址

查詢部門最高工資的員工信息_Rainys-CSDN博客_查詢每個部門最高工資的員工信息

表Employee保存了所有的員工數據。

Id	Name	Salary	DepartmentId
1	Joe	70000	1
2	Henry	80000	2
3	Sam	60000	2
4	Max	90000	1

 
表Department保存了所有的部門數據。

Id	Name
1	IT
2	Sales

 
寫一段SQL查找出各部門工資最高的員工信息。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.name Department,
  E1.Name   AS Employee,
  E1.Salary AS Salary
FROM tab_Employee E1
JOIN tab_Department D
on E1.DepartmentId = D.Id
AND E1.Salary >=
  (SELECT MAX(Salary)
  FROM tab_Employee E2
  WHERE E1.DepartmentId = E2.DepartmentId
  );

答案二：

SELECT b.Name as Department,
  a.name   as Employee, 
  a.Salary as Salary 
FROM Employee as a, Department as b, 
  (select max(Salary) as Salary, DepartmentId from Employee group by DepartmentId) as c
WHERE a.DepartmentId = b.Id and 
  a.Salary = c.Salary and 
  a.DepartmentId = c.DepartmentId;