181. Employees Earning More Than Their Managers

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      |
+----------+

分析:

首先找到哪些是雇员,即ManagerId is not NULL;

下面是找到哪些雇员的工资比上级高,因为都是在同一个表中,所以应该给表起个别名。重点在Id=a,ManagerId;

select Name as Employee 
from Employee a
where ManagerId is not NULL
and Salary > (select Salary from Employee where Id=a.ManagerId);

IT文库 » 181. Employees Earning More Than Their Managers
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