Leetcode 181. Employees Earning More Than Their Managers

标签：where   more   tab   sql   sel   bsp   write   manage   hold   

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

思路：考虑同一个table Employee的两个copy e1 和 e2。Where 里面可以用AND。

# Write your MySQL query statement below
select e1.Name as Employee
from Employee as e1, Employee as e2
where e1.Salary > e2.Salary and e1.ManagerId=e2.Id)

Leetcode 181. Employees Earning More Than Their Managers

标签：where   more   tab   sql   sel   bsp   write   manage   hold   

原文地址：http://www.cnblogs.com/lettuan/p/6289166.html