46. ON DELETE CASCADE

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

When an order is deleted, automatically delete its order_items.

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Answer & Explanation

4 Answers

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Option A

ON DELETE UNIQUE;

Additional Explanation

This option is incorrect for the stated requirement.

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Option B

ON DELETE WHERE order_id;

Additional Explanation

This option is incorrect for the stated requirement.

Verified Correct Answer

Option C

ALTER TABLE order_items ADD CONSTRAINT fk_items_order FOREIGN KEY (order_id) REFERENCES orders(id) ON DELETE CASCADE;

Additional Explanation

Correct implementation. Prefer parameterized queries in application code, validate affected rows for UPDATE/DELETE, and use transactions for related writes.

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Option D

ON DELETE INDEX;

Additional Explanation

This option is incorrect for the stated requirement.