177. Nth Highest Salary

Write a SQL query to get the n^th highest salary from the Employee table.

+----+--------+| Id | Salary |+----+--------+| 1  | 100    || 2  | 200    || 3  | 300    |+----+--------+

For example, given the above Employee table, the n^th highest salary wheren = 2 is 200. If there is no n^th highest salary, then the query should returnnull.

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MySQL:

CREATE FUNCTION getNthHighestSalary(N INT) RETURNS INTBEGIN    DECLARE M INT;    SET M = N - 1;  RETURN (      # Write your MySQL query statement below.      select             distinct            Salary      from             Employee      order by             Salary desc      limit            M, 1  );END