DA0-002 Data Acquisition and Preparation Practice Question
A data analyst wants to generate a report showing employee names and their department names, but some employees are not assigned to any department. The analyst wants to include all employees. Which JOIN type should be used?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
LEFT JOIN
LEFT JOIN includes all rows from the left table (employees) even if no match in departments.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
INNER JOIN
Why it's wrong here
INNER JOIN only includes rows with matches in both tables.
- ✓
LEFT JOIN
Why this is correct
LEFT JOIN includes all employees, even those without a department.
- ✗
CROSS JOIN
Why it's wrong here
CROSS JOIN produces a Cartesian product, not appropriate.
- ✗
RIGHT JOIN
Why it's wrong here
RIGHT JOIN includes all from departments, not employees.
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