181. Employees Earning More Than Their Managers

题目描述和难度

  • 题目描述:

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

思路分析

求解关键:

用于测试的 SQL 语句:

drop table if exists Employee;

create table Employee(
  Id int primary key auto_increment,
  Name varchar(200),
  Salary int,
  ManagerId int
);

insert into Employee(Id,name,Salary,ManagerId) values(1,'Joe',70000,3);
insert into Employee(Id,name,Salary,ManagerId) values(2,'Henry',80000,4);
insert into Employee(Id,name,Salary,ManagerId) values(3,'Sam',60000,NULL);
insert into Employee(Id,name,Salary,ManagerId) values(4,'Max',90000,NULL);

参考解答

参考解答1

select t1.Name as Employee from Employee t1,Employee t2
where t1.`ManagerId` = t2.`Id` and t1.`Salary` > t2.`Salary`;

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