Nth Highest Salary
Created: April 7, 2020 by [lek-tin]
Last updated: April 7, 2020
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
DECLARE M INT;
SET M = N - 1;
RETURN (
SELECT
IFNULL(
(
SELECT
DISTINCT Salary
FROM
Employee
ORDER BY Salary Desc
LIMIT 1
OFFSET M
),
NULL
)
);
END