177. Nth Highest Salary

中文文档

Description

Write a SQL query to get the n^th highest salary from the Employee table.

+----+--------+

| Id | Salary |

+----+--------+

| 1  | 100    |

| 2  | 200    |

| 3  | 300    |

+----+--------+

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

+------------------------+

| getNthHighestSalary(2) |

+------------------------+

| 200                    |

+------------------------+

Solutions

SQL

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