SQL部门工资前三高的所有员工
2021/12/17 19:53:27
本文主要是介绍SQL部门工资前三高的所有员工,对大家解决编程问题具有一定的参考价值,需要的程序猿们随着小编来一起学习吧!
LeetCode原题
https://leetcode-cn.com/problems/department-top-three-salaries/
初始sql
DROP TABLE IF EXISTS `employee`; CREATE TABLE `employee` ( `id` int(11) DEFAULT NULL, `name` varchar(255) DEFAULT NULL, `salary` decimal(10,2) DEFAULT NULL, `deptId` int(11) DEFAULT NULL ) ENGINE=InnoDB DEFAULT CHARSET=utf8; INSERT INTO `employee` VALUES ('1', 'Joe', '85000.00', '1'); INSERT INTO `employee` VALUES ('2', 'Henry', '80000.00', '2'); INSERT INTO `employee` VALUES ('3', 'Sam', '60000.00', '2'); INSERT INTO `employee` VALUES ('4', 'Max', '90000.00', '1'); INSERT INTO `employee` VALUES ('5', 'Janet', '69000.00', '1'); INSERT INTO `employee` VALUES ('6', 'Randy', '85000.00', '1'); INSERT INTO `employee` VALUES ('7', 'Will', '70000.00', '1');
DROP TABLE IF EXISTS `department`; CREATE TABLE `department` ( `id` int(11) DEFAULT NULL, `name` varchar(255) DEFAULT NULL ) ENGINE=InnoDB DEFAULT CHARSET=utf8; INSERT INTO `department` VALUES ('1', 'IT'); INSERT INTO `department` VALUES ('2', 'Sales ');
需求:找出每个部门获得前三高工资的所有员工
首先
思路:用Employee和自己做连接,连接条件是部门相同但是工资比我高,那么接下来按照having count(Salary) <= 2来筛选,原理是跟我一个部门而且工资比我高的人数不超过2个,那么我一定是部门工资前三,并求出这些员工id
select e1.Id from Employee as e1 left join Employee as e2 on e1.DeptId = e2.DeptId and e1.Salary < e2.Salary group by e1.Id having count(distinct e2.Salary) <= 2
外层查询只需要连接一下部门得到名字
select d.Name as Department,e.Name as Employee,e.Salary as Salary from Employee as e left join Department as d on e.DeptId = d.Id where e.Id in ( select e1.Id from Employee as e1 left join Employee as e2 on e1.DeptId = e2.DeptId and e1.Salary < e2.Salary group by e1.Id having count(distinct e2.Salary) <= 2 )
这篇关于SQL部门工资前三高的所有员工的文章就介绍到这儿,希望我们推荐的文章对大家有所帮助,也希望大家多多支持为之网!
- 2024-05-31全网首发第二弹!软考2024年5月《软件设计师》真题+解析+答案!(11-20题)
- 2024-05-31全网首发!软考2024年5月《软件设计师》真题+解析+答案!(21-30题)
- 2024-05-30【Java】百万数据excel导出功能如何实现
- 2024-05-30我们小公司,哪像华为一样,用得上IPD(集成产品开发)?
- 2024-05-30java excel上传--poi
- 2024-05-30安装笔记本应用商店的pycharm,再安排pandas等模块,说是没有打包工具?
- 2024-05-29java11新特性
- 2024-05-29哪些无用敏捷指标正在破坏敏捷转型?
- 2024-05-29鸿蒙原生应用再新丁!新华社 入局鸿蒙
- 2024-05-29设计模式 之 迭代器模式(Iterator)