Second-Highest Salary SQL | Dataford Interview Questions

Airtel engineering leadership wants a salary benchmark alongside department-level workforce statistics. Write a PostgreSQL query that identifies the second-highest distinct salary and returns it with aggregated statistics for every Airtel department.

Requirements

Use a window function to find the second-highest distinct non-NULL salary and count how many employees earn it.
Return every department, including departments with no employees, using a LEFT JOIN.
For each department, calculate total employees, active employees, and average salary rounded to two decimal places.
Order the result by department_id ascending.

Schema

departments

Column	Type	Description
department_idPK	INTEGER	Unique department identifier
department_name	VARCHAR(100)	Airtel department name

employees

Column	Type	Description
employee_idPK	INTEGER	Unique employee identifier
employee_name	VARCHAR(100)	Employee full name
salary	NUMERIC(12,2)	Annual employee salary
department_id	INTEGER	Referenced department identifier
employment_status	VARCHAR(20)	Current employment status

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