Leetcode SQL

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

Hint: When the question asks about ranking, think of using ‘DISTINCT’

Solution:

create function getNthHighestSalary(n int) returns int
begin
    set n = n - 1;
    return (select distinct Salary from Employee order by Salary desc limit 1 offset n); 
end

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