文巾解题 184. 部门工资最高的员工

Posted 2021-08-10 刘文巾

1 题目描述

2 解题思路 

先在employee表中找到每个部门工资最高是多少钱（DS）

然后在employee表中找工资等于最高工资的员工。（联立employee表中的E）

最后通过Department表，把部门的id转换成字符串（联立department表的D）

SELECT D.Name AS Department,
       E2.Name AS Employee,
       E2.Salary AS Salary
FROM (SELECT MAX(E.Salary) AS M_S,
             E.DepartmentId AS D_Id
      FROM Employee E
      GROUP BY E.DepartmentId) AS DS,
      Employee E2, 
      Department D
WHERE E2.Salary=DS.M_S 
      AND E2.DepartmentId=DS.D_Id 
      AND E2.DepartmentId=D.Id