The RIGHT JOIN in SQL returns all records from the right table, and the matched records from the left table. If there’s no match, the result will include NULL for columns from the left table, making it useful for reverse data inclusion.
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What happens when there is no matching row in the left table?
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Question 4 of 15
4. Question
Choose the correct syntax for RIGHT JOIN:
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Question 5 of 15
5. Question
If right table has 5 rows, left has 3 matching rows, how many rows will RIGHT JOIN return?
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Question 6 of 15
6. Question
Which clause is mandatory in a RIGHT JOIN query?
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Question 7 of 15
7. Question
What’s the key difference between LEFT JOIN and RIGHT JOIN?
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Question 8 of 15
8. Question
Which result shows unmatched right table rows using LEFT JOIN?
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Question 9 of 15
9. Question
What does this query return?
SELECT * FROM orders o RIGHT JOIN customers c ON o.customer_id = c.id;
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Question 10 of 15
10. Question
What happens if right table’s column is used in WHERE clause after RIGHT JOIN?
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Question 11 of 15
11. Question
Which JOIN guarantees no NULLs from the right table?
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Question 12 of 15
12. Question
What happens if both tables have no match in any row?
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Question 13 of 15
13. Question
How can you find customers who haven’t placed any orders using RIGHT JOIN?
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Question 14 of 15
14. Question
In which case will RIGHT JOIN behave like INNER JOIN?
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Question 15 of 15
15. Question
What is true about RIGHT JOIN performance?
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Summary
The RIGHT JOIN ensures that no data from the right table is lost, even if no matches exist in the left. It is ideal for reports where right-side completeness is critical, such as customer lists with optional transactions.
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