2190. Inventory: Release reserved stock after an order is cancelled. — Node.js + Express + mysql2

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

In a inventory module, solve this as a production problem using Node.js + Express + mysql2: Release reserved stock after an order is cancelled. Provide the SQL, explain the logic, show safe application integration, and mention failure/edge cases.

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Answer & Explanation

4 Answers

Verified

Option A

SELECT * FROM table_name;

Additional Explanation

Incorrect: it does not satisfy the stated business rule and can return/change unintended data.

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Option B

DELETE FROM table_name;

Additional Explanation

Incorrect: it does not satisfy the stated business rule and can return/change unintended data.

Verified Correct Answer

Option C

UPDATE products p JOIN order_items oi ON oi.product_id=p.id SET p.stock=p.stock+oi.quantity WHERE oi.order_id=:order_id;

Additional Explanation

For production use, ensure this operation is idempotent so the same cancellation cannot release stock twice.

Verified

Option D

UPDATE table_name SET status='active';

Additional Explanation

Incorrect: it does not satisfy the stated business rule and can return/change unintended data.