LeetCode 181. Employees Earning More Than Their Managers
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题目描述:
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 |+----------+
题目大意:
雇员表记录了所有雇员的信息,包括他们的经理在内。每一个雇员都有一个Id,和他的经理的Id。
给定雇员表,编写一个SQL查询找出薪水大于经理的员工姓名。对于上表来说,Joe是唯一收入大于经理的员工。
解题思路:
自连接
SQL语句:
# Write your MySQL query statement belowselect a.name as Employee from Employee a,Employee b where a.ManagerId = b.Id and a.Salary > b.Salary
原文:
http://bookshadow.com/weblog/2015/01/16/leetcode-employees-earning-more-their-managers/
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