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problems/database/176.md

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## 题目
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[176. 第二高的薪水](https://leetcode-cn.com/problems/second-highest-salary/)
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## 思路
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需要找出表中第二高的薪水,可以考虑先找出最高的薪水,再从表中找出小于最高薪水剩余部分中最高的薪水,即为第二高薪水。
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## 代码
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```
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# Write your MySQL query statement below
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select max(e1.Salary) as SecondHighestSalary
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from Employee e1
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where e1.Salary < (
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select max(e2.Salary) from Employee e2
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);
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```
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## 相关知识
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