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+<h2><a href="https://leetcode.com/problems/second-highest-salary/">176. Second Highest Salary</a></h2><h3>Medium</h3><hr><div class="sql-schema-wrapper__3VBi"><a class="sql-schema-link__3cEg">SQL Schema<svg viewBox="0 0 24 24" width="1em" height="1em" class="icon__1Md2"><path fill-rule="evenodd" d="M10 6L8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"></path></svg></a></div><div><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>
+</div>