[LeetCode] 181.Employees Earning More Than Their Managers 员工挣得比经理多
TheEmployeetable 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 theEmployeetable, 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 |
+———-+
这道题给我们了一个Employee表,里面有员工的薪水信息和其经理的信息,经理也属于员工,其经理Id为空,让我们找出薪水比其经理高的员工,那么就是一个很简单的比较问题了,我们可以生成两个实例对象进行内交通过ManagerId和Id,然后限制条件是一个Salary大于另一个即可:
解法一:
?
1 2 3 | SELECT e1.Name FROM Employee e1 JOIN Employee e2 ON e1.ManagerId = e2.Id WHERE e1.Salary > e2.Salary; |
我们也可以不用Join,直接把条件都写到where里也行:
解法二:
?
1 2 | SELECT e1.Name FROM Employee e1, Employee e2 WHERE e1.ManagerId = e2.Id AND e1.Salary > e2.Salary; |
参考资料:
https://leetcode.com/discuss/88189/two-straightforward-way-using-where-and-join
到此这篇关于SQL实现LeetCode(181.员工挣得比经理多)的文章就介绍到这了,更多相关SQL实现员工挣得比经理多内容请搜索钦钦技术栈以前的文章或继续浏览下面的相关文章希望大家以后多多支持钦钦技术栈!
原文链接:https://www.cnblogs.com/grandyang/p/5354306.html
版权声明:本文(即:原文链接:https://www.qin1qin.com/catagory/6069/)内容由互联网用户自发投稿贡献,该文观点仅代表作者本人。本站仅提供信息存储空间服务,不拥有所有权,不承担相关法律责任。如发现本站有涉嫌抄袭侵权/违法违规的内容, 请发送邮件至 630367839@qq.com 举报,一经查实,本站将立刻删除。