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Crucial Exams

CompTIA Data+ DA0-002 (V2) Practice Question

An analyst needs to find departments that currently have no employees recorded in the HR database. The PostgreSQL tables are:

departments

dept_id | dept_name
--------|-----------
1       | Finance
2       | HR
3       | IT
4       | Marketing

employees

emp_id | full_name | dept_id
-------|-----------|--------
101    | Alice     | 1
102    | Bob       | 1
103    | Carol     | 3
104    | Dave      | 3
105    | Eve       | NULL

The analyst runs the query:

SELECT d.dept_name, COUNT(e.emp_id) AS emp_count
FROM departments d
LEFT JOIN employees e
  ON d.dept_id = e.dept_id
GROUP BY d.dept_name
HAVING COUNT(e.emp_id) = 0;

Which rows will the query return?

  • HR and Marketing only

  • All four departments with their respective employee counts

  • Finance and IT only

  • Employees whose dept_id is NULL (for example, Eve)

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