思路：

今天复习数据库突然想起来leetcode上数据库的题目，就找来做了

（1）给表取别名

格式见code，这在自身连接的时候是很有必要的

（2）自身连接

from语句后面相当于接了“一张表”，如果是多个表，就相当于形成了他们的笛卡尔积

然后通过where语句选择出所需要的行，通过头上的select语句选出相应的列

# Write your MySQL query statement below

select a.Name from Employee as a,Employee as b

where a.ManagerId = b.Id and a.Salary > b.Salary

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