Explain SQL Joins | Dataford Interview Questions

Explain SQL joins.

Asked in the Round 3 - Hiring Manager stage. Fundamentals check.

Using the supplied department and employee data, write a query that returns every department and the number of associated employees, including departments with no matching employees.

Output

One row per department with department_name and employee_count
Include departments with zero employees
Sort alphabetically by department_name

Schema

departments

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

employees

Column	Type	Description
employee_idPK	INT	Unique employee identifier
employee_name	VARCHAR(100)	Employee name
department_id	INT	Associated department identifier

Your question is Explain SQL Joins. Start with the requirements and the two tables in the Question tab.

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Problem