"Leetcode Database" 177. Nth Highest Salary

Source: Internet
Author: User
Tags mysql query

Topic:

Write a SQL query to get the nth highest salary from the Employee table.

+----+--------+
| Id | Salary |
+----+--------+
| 1 | |    | 2 | |
3  |
+----+--------+

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. Analytical:

Remove all salary and then sort, and then take the limit method to get the nth number. The code is as follows:

CREATE FUNCTION getnthhighestsalary (N INT) RETURNS int
BEGIN
      DECLARE N1 int;
      SET N1 = N-1;
  Return (
      # Write your MySQL query statement below.
      Select Salary from (select DISTINCT Salary to Employee) e order by Salary DESC LIMIT
  );
End
Note: Limit must not write N-1 after the limit, because the expression cannot be followed.

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