177. Nth Highest Salary

Posted 2020-11-25 hyxsolitude

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                    |
+------------------------+

 1 CREATE FUNCTION getNthHighestSalary(N INT) RETURNS INT
 2 BEGIN
 3   SET N = N - 1;
 4   RETURN (
 5       # Write your mysql query statement below.
 6       
 7       SELECT DISTINCT Salary 
 8       FROM Employee
 9       ORDER BY Salary DESC
10       LIMIT N, 1
11   );
12 END