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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/* Placeholder function for SQL query in Java */
2public String getNthHighestSalary_SQL(int n) {
3 return "SELECT DISTINCT salary FROM Employee ORDER BY salary DESC LIMIT 1 OFFSET " + (n-1);
4}
5
6// Use JDBC for executing this query in a database environment.This Java method returns a SQL query string. Actual query execution should be performed in a database setting using JDBC or similar connectivity libraries.
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.
This function generates an SQL query string that uses the DENSE_RANK function to assign ranks and filter out the nth highest salary.