Max Salary Per Department | Dataford Interview Questions

Your question is Max Salary Per Department. Start with the requirements and the two tables on the right.

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Problem

HID WorkforceID needs a salary review showing the highest-paid employee or employees in each department. Write a PostgreSQL query that returns all employees tied for the maximum salary within their department.

Requirements

Join employees to departments and return the department name, employee name, and salary.
Use a window function to rank employees within each department by salary in descending order.
Return every employee tied for the highest non-null salary. Exclude employees whose salary is NULL.
Sort the result by department name and employee name.

Schema

departments

Column	Type	Description
department_idPK	INT	Primary key for the department
department_name	VARCHAR(100)	Department name
location	VARCHAR(100)	Primary office location

employees

Column	Type	Description
employee_idPK	INT	Primary key for the employee
employee_name	VARCHAR(100)	Employee's full name
department_id	INT	References departments.department_id
job_title	VARCHAR(100)	Employee's job title
salary	NUMERIC(12,2)	Annual salary