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+<h2><a href="https://leetcode.com/problems/nth-highest-salary/">177. Nth Highest Salary</a></h2><h3>Medium</h3><hr><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 the <code>n<sup>th</sup></code> highest salary from the <code>Employee</code> table. If there is no <code>n<sup>th</sup></code> highest salary, return&nbsp;<code>null</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    |
++----+--------+
+n = 2
+<strong>Output:</strong> 
++------------------------+
+| getNthHighestSalary(2) |
++------------------------+
+| 200                    |
++------------------------+
+</pre>
+
+<p><strong class="example">Example 2:</strong></p>
+
+<pre>
+<strong>Input:</strong> 
+Employee table:
++----+--------+
+| id | salary |
++----+--------+
+| 1  | 100    |
++----+--------+
+n = 2
+<strong>Output:</strong> 
++------------------------+
+| getNthHighestSalary(2) |
++------------------------+
+| null                   |
++------------------------+
+</pre>