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LeetCode: 184. 部门工资最高的员工

1、题目描述

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  |
+------------+----------+--------+

2、解题思路

​ 在员工所属的部门中,找出最高工资,然后判断当前员工是不是,如果是,就把他选出来

# Write your MySQL query statement below
select d.Name as  Department , e.Name as  Employee , e.Salary as Salary from Employee e, Department d where e.DepartmentId = d.Id and e.Salary = (select max(Salary) from Employee em where  em.DepartmentId = d.Id)