SQL Query for Above-Average Salary | Dataford Interview Questions

Dayforce workforce reporting needs to identify employees whose annual salary is above the company-wide average. Write a PostgreSQL query that returns these employees with their department information.

Requirements

Calculate the average of all non-NULL values in employees.annual_salary.
Return employees whose salary is strictly greater than that average.
Include employees even when they have no department assignment, using a LEFT JOIN.
Return results ordered from highest salary to lowest salary, with employee_id as a tie-breaker.

Schema

employees

Column	Type	Description
employee_idPK	INT	Unique employee identifier
employee_name	VARCHAR(100)	Employee's full name
department_id	INT	References the employee's department
annual_salary	NUMERIC(10,2)	Employee's annual salary

departments

Column	Type	Description
department_idPK	INT	Unique department identifier
department_name	VARCHAR(100)	Department name

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