The FULL OUTER JOIN in SQL combines the results of both LEFT JOIN and RIGHT JOIN. It returns all records from both tables, with NULLs where there is no match — making it ideal for complete, unmatched data comparisons.
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Which keyword is functionally the same as FULL OUTER JOIN?
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Question 3 of 15
3. Question
What happens when there’s no match in either table?
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Question 4 of 15
4. Question
Choose the correct syntax for FULL OUTER JOIN:
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Question 5 of 15
5. Question
If Table A has 3 rows and Table B has 4 rows with only 2 matching rows, how many rows does FULL JOIN return?
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Question 6 of 15
6. Question
In which case is FULL OUTER JOIN most useful?
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Question 7 of 15
7. Question
What clause defines how tables are joined?
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Question 8 of 15
8. Question
Which statement is true for FULL OUTER JOIN?
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Question 9 of 15
9. Question
What is the result of this query?
SELECT * FROM employees e FULL OUTER JOIN departments d ON e.dept_id = d.id;
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Question 10 of 15
10. Question
How do unmatched rows appear in FULL JOIN results?
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Question 11 of 15
11. Question
Which of the following JOINs will return the most rows typically?
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Question 12 of 15
12. Question
What happens if there are no matching rows between the two tables in a FULL OUTER JOIN?
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Question 13 of 15
13. Question
Can you filter only unmatched rows using FULL OUTER JOIN?
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Question 14 of 15
14. Question
What is the effect of using WHERE clause with non-nullable conditions after FULL JOIN?
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Question 15 of 15
15. Question
FULL OUTER JOIN is supported in:
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Summary
The FULL OUTER JOIN gives you complete visibility into both matched and unmatched data across two tables. It is essential for data reconciliation, audit reports, and understanding gaps between datasets.
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