Mysql__leecode/0181.超过经理收入的员工

一、刷题内容

原题链接

https://leetcode-cn.com/problems/employees-earning-more-than-their-managers/

内容描述

SQL架构
Employee 表包含所有员工，他们的经理也属于员工。每个员工都有一个 Id，此外还有一列对应员工的经理的 Id。

+----+-------+--------+-----------+
| Id | Name  | Salary | ManagerId |
+----+-------+--------+-----------+
| 1  | Joe   | 70000  | 3         |
| 2  | Henry | 80000  | 4         |
| 3  | Sam   | 60000  | NULL      |
| 4  | Max   | 90000  | NULL      |
+----+-------+--------+-----------+

给定 Employee 表，编写一个 SQL 查询，该查询可以获取收入超过他们经理的员工的姓名。在上面的表格中，Joe 是唯一一个收入超过他的经理的员工。

+----------+
| Employee |
+----------+
| Joe      |
+----------+

二、解题方法

1.方法一：where语句

# Write your MySQL query statement below
select 
	a.Name as 'Employee'
from  
	Employee as a ,
	Employee as b
where 
	a.ManagerId = b.Id 
	and a.Salary >b.Salary; 

2.方法二：join语句

# Write your MySQL query statement below
select 
	a.Name as 'Employee'
from  
	Employee a join Employee as b
	on a.ManagerId = b.Id 
	and a.Salary >b.Salary;