Leetcode 181 Employees Earning More Than Their Managers

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The Employee table holds all employees including their managers. Every employee has an Id, and there is also a column for the manager Id.

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

Given the Employee table, write a SQL query that finds out employees who earn more than their managers. For the above table, Joe is the only employee who earns more than his manager.

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

方法一：内联

select a.Name from Employee a inner join Employee b on a.ManagerId = b.Id
where a.Salary > b.Salary

方法二

select a.Name from Employee a, Employee b
where a.ManagerId = b.Id and a.Salary > b.Salary

Leetcode 181 Employees Earning More Than Their Managers

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原文地址：http://www.cnblogs.com/lilixu/p/4610223.html