Project Notes

Second Highest Salary

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Description

tab: English
 
<p>Table: <code>Employee</code></p>
 
<pre>
+-------------+------+
| Column Name | Type |
+-------------+------+
| id          | int  |
| salary      | int  |
+-------------+------+
id is the primary key (column with unique values) for this table.
Each row of this table contains information about the salary of an employee.
</pre>
 
<p>&nbsp;</p>
 
<p>Write a solution to find&nbsp;the second highest <strong>distinct</strong> salary from the <code>Employee</code> table. If there is no second highest salary,&nbsp;return&nbsp;<code>null (return&nbsp;None in Pandas)</code>.</p>
 
<p>The result format is in the following example.</p>
 
<p>&nbsp;</p>
<p><strong class="example">Example 1:</strong></p>
 
<pre>
<strong>Input:</strong> 
Employee table:
+----+--------+
| id | salary |
+----+--------+
| 1  | 100    |
| 2  | 200    |
| 3  | 300    |
+----+--------+
<strong>Output:</strong> 
+---------------------+
| SecondHighestSalary |
+---------------------+
| 200                 |
+---------------------+
</pre>
 
<p><strong class="example">Example 2:</strong></p>
 
<pre>
<strong>Input:</strong> 
Employee table:
+----+--------+
| id | salary |
+----+--------+
| 1  | 100    |
+----+--------+
<strong>Output:</strong> 
+---------------------+
| SecondHighestSalary |
+---------------------+
| null                |
+---------------------+
</pre>
 
 
 
---
 
[submissions](https://leetcode.com/problems/second-highest-salary/submissions/) | [solutions](https://leetcode.com/problems/second-highest-salary/solutions/)
 
 
tab: 中文
 
<code>Employee</code> 表：
<div class="original__bRMd">
<div>
<pre>
+-------------+------+
| Column Name | Type |
+-------------+------+
| id          | int  |
| salary      | int  |
+-------------+------+
id 是这个表的主键。
表的每一行包含员工的工资信息。
</pre>
 
<p>&nbsp;</p>
 
<p>查询并返回 <code>Employee</code>&nbsp;表中第二高的 <b>不同</b>&nbsp;薪水 。如果不存在第二高的薪水，查询应该返回 <code>null(Pandas 则返回 None)</code> 。</p>
 
<p>查询结果如下例所示。</p>
 
<p>&nbsp;</p>
 
<p><strong>示例 1：</strong></p>
 
<pre>
<strong>输入：</strong>
Employee 表：
+----+--------+
| id | salary |
+----+--------+
| 1  | 100    |
| 2  | 200    |
| 3  | 300    |
+----+--------+
<strong>输出：</strong>
+---------------------+
| SecondHighestSalary |
+---------------------+
| 200                 |
+---------------------+
</pre>
 
<p><strong>示例 2：</strong></p>
 
<pre>
<strong>输入：</strong>
Employee 表：
+----+--------+
| id | salary |
+----+--------+
| 1  | 100    |
+----+--------+
<strong>输出：</strong>
+---------------------+
| SecondHighestSalary |
+---------------------+
| null                |
+---------------------+
</pre>
</div>
</div>
 
 
 
---
 
[提交记录](https://leetcode.cn/problems/second-highest-salary/submissions/) | [题解](https://leetcode.cn/problems/second-highest-salary/solution/)

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