177. Nth Highest Salary
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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.
Code
CREATE FUNCTION getNthHighestSalary(N INT) RETURNS INT
BEGIN
declare M INT;
set M=N-1;
RETURN (
# Write your MySQL query statement below.
select distinct Salary from Employee order by Salary desc limit M, 1
);
END
Idea
limit M, 1 means return one element since M element.