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add leetcode problem-cn part6

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算法题（国内版）/problem (Chinese)/第二高的薪水 [second-highest-salary].html Normal file
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<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>编写一个 SQL 查询，获取并返回 <code>Employee</code>&nbsp;表中第二高的薪水 。如果不存在第二高的薪水，查询应该返回 <code>null</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>