Question
Formatted question description: https://leetcode.ca/all/177.html
177 Nth Highest Salary
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 |
+------------------------+
Algorithm
Change the 1 after OFFSET
to N-1
, but then MySQL will report an error and it is estimated that the operation is not supported. Then we can add a SET N = N-1
in front.
Code
SQL
CREATE FUNCTION getNthHighestSalary(N INT) RETURNS INT
BEGIN
DECLARE M INT;
SET M=N-1; # index issue
RETURN (
# Write your MySQL query statement below.
SELECT DISTINCT Salary
FROM Employee
ORDER BY Salary DESC
LIMIT 1
OFFSET M
);
END