Nth Highest Salary

Write a SQL query to get the nth highest salary from the Employee table.

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

For example, given the above Employee table, the nth highest salary where n = 2 is 200. If there is no nth highest salary, then the query should return null.

+------------------------+ | getNthHighestSalary(2) | +------------------------+ | 200 | +------------------------+

Solution

CREATE FUNCTION getNthHighestSalary(N INT) RETURNS INT
BEGIN
  SET N = N - 1;
  RETURN (
      # Write your MySQL query statement below.

      select distinct e.Salary
      from Employee e
      order by e.Salary desc
      limit N, 1

  );
END