Self-Join Manager Salary Check | Dataford Interview Questions

Your question is Self-Join Manager Salary Check. Start with the requirements and the one table on the right.

Run and submit as often as you like. When you're ready, talk me through your approach or go straight to the code.

Problem

Tiger Analytics is reviewing workforce compensation data to identify reporting relationships that may require management attention. Write a PostgreSQL query using a self-join on the employees table to find employees who earn more than their direct managers.

Requirements

Join each employee to the employee record identified by manager_id.
Return the employee ID, employee name, employee salary, manager ID, manager name, and manager salary.
Include only employees whose salary is strictly greater than their manager's salary.
Exclude employees with no matching manager record and order the results by employee ID ascending.

Schema

employees

Column	Type	Description
employee_idPK	INTEGER	Unique identifier for the employee
employee_name	VARCHAR(100)	Employee's full name
salary	NUMERIC(10,2)	Employee's annual salary
manager_id	INTEGER	Employee ID of the direct manager

Your question is Self-Join Manager Salary Check. Start with the requirements and the one table on the right.

Run and submit as often as you like. When you're ready, talk me through your approach or go straight to the code.

Requirements

Join each employee to the employee record identified by manager_id.
Return the employee ID, employee name, employee salary, manager ID, manager name, and manager salary.
Include only employees whose salary is strictly greater than their manager's salary.
Exclude employees with no matching manager record and order the results by employee ID ascending.

Schema

employees

Column	Type	Description
employee_idPK	INTEGER	Unique identifier for the employee
employee_name	VARCHAR(100)	Employee's full name
salary	NUMERIC(10,2)	Employee's annual salary
manager_id	INTEGER	Employee ID of the direct manager