leetcode 177. Nth Highest Salary

177. Nth Highest Salary

 

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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.

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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 Salary Desc limit N,1
  );
END