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描述：
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 |
实现：
select e.Name as Employee from Employee e, Employee m
where e.ManagerId=m.Id and e.Salary>m.Salary
分析：
Runtime：1521ms beats 25.21%
这个蛮简单就是为什么效率这么低，应该是用的连接有问题，再看。
Database 181. Employees Earning More Than Their Managers
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原文地址：http://www.cnblogs.com/hippiebaby/p/5365070.html
