Description

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

Solutions

1. Limit

CREATE FUNCTION getNthHighestSalary(N INT) RETURNS INT
BEGIN
DECLARE M INT DEFAULT N-1;
-- DECLARE M INT;
-- SET M=N-1;
  RETURN (
      # Write your MySQL query statement below.
      SELECT ( SELECT DISTINCT Salary
      FROM Employee
      ORDER by Salary DESC
      -- LIMIT 1 offset M
      LIMIT M, 1
      )
  );
END

-- 14/14 cases passed (184 ms)
-- Your runtime beats 97.82 % of mysql submissions
-- Your memory usage beats 100 % of mysql submissions (0B)

References

  1. 177. Nth Highest Salary