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Crucial Exams

CompTIA Data+ DA0-002 (V2) Practice Question

An HR analytics team is preparing a compensation report. The company database has two tables: Departments (dept_id, dept_name) and Employees (emp_id, dept_id, salary). The analyst must create a query that shows every department name together with the average salary of its employees, even when a department currently has no employees. Which SQL operation should be used to combine the tables before calculating AVG(salary) to satisfy this requirement?

  • Create a CROSS JOIN of Departments and Employees and filter on dept_id in a WHERE clause.

  • Combine the tables with UNION ALL on dept_id and then GROUP BY dept_name.

  • Use an INNER JOIN between Employees and Departments and then GROUP BY dept_name.

  • Perform a LEFT OUTER JOIN of Departments to Employees and then GROUP BY dept_name.

CompTIA Data+ DA0-002 (V2)
Data Acquisition and Preparation
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