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      |+----------+ 自连接 找出比其上司挣得更多的员工 MySQL（1686ms）：

1 SELECT e1.Name AS Employee2 FROM Employee AS e1 , Employee AS e23 WHERE e1.ManagerId = e2.Id4   AND e1.Salary > e2.Salary ;