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 |
+----------+
查找表中员工工资比经理工资高的数据
- 员工的数据是有ManagerId的,可以使用连接查询,e1是查的员工的数据,e2是查的经理的数据,然后条件是e1中的salary字段要比e2中的大。
select
e1.name as Employee
from
Employee e1
inner join
Employee e2
on e1.managerId = e2.id
and e1.salary > e2.salary