FC0-U71 Data and Database Fundamentals Practice Question
A database contains two tables: 'Authors' (AuthorID, Name) and 'Books' (BookID, Title, AuthorID). A query needs to return all authors and any books they have written, including authors with no books. Which type of JOIN 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
A LEFT JOIN returns all rows from the left table (Authors) and matching rows from the right table (Books). If no match, NULLs are returned for the right table.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
CROSS JOIN
Why it's wrong here
CROSS JOIN produces a Cartesian product, not appropriate.
- ✗
RIGHT JOIN
Why it's wrong here
RIGHT JOIN would include all books, not all authors.
- ✓
LEFT JOIN
Why this is correct
Correct; LEFT JOIN includes all authors.
- ✗
INNER JOIN
Why it's wrong here
INNER JOIN excludes authors with no books.
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