leetcode nth highest salary mysql

Employee

+-------------+------+
| 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.


Write a solution to find the nth highest distinct salary
from the Employee table. If there are less than n distinct
salaries, return null.

The result format is in the following example.

Example 1:

Input:
Employee table:
+----+--------+
| id | salary |
+----+--------+
| 1 | 100 |
| 2 | 200 |
| 3 | 300 |
+----+--------+
n = 2
Output:
+------------------------+
| getNthHighestSalary(2) |
+------------------------+
| 200 |
+------------------------+