Employees Reporting to One Manager | Dataford Interview Questions

Your question is Employees Reporting to One Manager. Start with the requirements and the two tables on the right.

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Problem

Business Context

Health Catalyst uses employee reporting data to support organizational views in its Data Operating System. An engineering lead needs a list of everyone who reports directly to one manager.

Task

Write a PostgreSQL query that returns all direct reports for the manager whose employee_id is supplied as parameter \$1. Do not include the manager in the result.

Requirements

Use a self-join on employees to match each employee to the requested manager.
Return the employee ID, name, job title, department name, and manager name.
Use a LEFT JOIN for department names so an employee with no department still appears.
Sort results alphabetically by employee name, then by employee ID.

Schema

employees

Column	Type	Description
employee_idPK	INT	Unique employee identifier
employee_name	VARCHAR(100)	Employee full name
job_title	VARCHAR(100)	Employee job title
manager_id	INT	Direct manager employee ID
department_id	INT	Employee department identifier

departments

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