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This approach uses the SQL query constructs to fetch the nth highest salary directly from the database. We will utilize ORDER BY, DISTINCT, LIMIT, and OFFSET to achieve this.
Steps:
SELECT DISTINCT.ORDER BY salary DESC.LIMIT and OFFSET to skip the first n-1 results and take the nth result if it exists.1/* As SQL query requires running in a database environment, this is a placeholder function */
2#include <stdio.h>
3
4/* In a database environment, use this SQL query directly */
5const char* getNthHighestSalary_SQL(int n) {
6 return "SELECT DISTINCT salary FROM Employee ORDER BY salary DESC LIMIT 1 OFFSET ?";
7}
8
9/* Explanation: This function returns the SQL query as a string. The actual execution needs to be done in an SQL environment. */This function is a stub that generates an SQL query string. The actual execution with parameters would be performed using an SQL interface in C like SQLite or MySQL Connector C API.
In this approach, we will use the DENSE_RANK() window function available in SQL to assign ranks to salaries based on their value.
Steps:
DENSE_RANK by partitioning properly.n.public string GetNthHighestSalaryDenseRankSQL(int n) {
return $"SELECT salary FROM (SELECT salary, DENSE_RANK() OVER (ORDER BY salary DESC) as rank FROM Employee) Ranked WHERE rank = {n}";
}
// Requires use of database frameworks capable of SQL window functions.This C# method returns a SQL string using DENSE_RANK to rank and select the nth highest salary. Execution is done within databases that support windowing functions.