1885. Delete orphan rows — Banking — implementation variant 35

DBMS Published 30 Sept 2026 Updated 30 Sept 2026 0 Views Verified

In a Banking application, implement this production problem: Delete order items whose order no longer exists. The API/service receives user input and must return or modify data safely. Give the SQL solution, explain why it works, and show how the same operation is called from the selected stack.

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Answer & Explanation

4 Answers

Verified

Option A

SELECT * FROM the_table;

Additional Explanation

Incorrect: it does not implement the stated business rule and may modify/fetch the wrong rows.

Verified

Option B

UPDATE the_table SET status='active';

Additional Explanation

Incorrect: it does not implement the stated business rule and may modify/fetch the wrong rows.

Verified Correct Answer

Option C

DELETE oi FROM order_items oi LEFT JOIN orders o ON o.id=oi.order_id WHERE o.id IS NULL;

Additional Explanation

The anti-join identifies orphan children. Prefer foreign keys with appropriate actions so new orphans cannot be created.

Verified

Option D

DELETE FROM the_table;

Additional Explanation

Incorrect: it does not implement the stated business rule and may modify/fetch the wrong rows.