3667. Inventory: Find products whose stock differs from the sum of inventory movements. — Concurrency

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

In a inventory module, solve this as a production problem using Concurrency: Find products whose stock differs from the sum of inventory movements. 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

UPDATE table_name SET status='active';

Additional Explanation

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

Verified Correct Answer

Option B

SELECT p.id,p.stock,COALESCE(SUM(m.delta_qty),0) movement_stock FROM products p LEFT JOIN inventory_movements m ON m.product_id=p.id GROUP BY p.id,p.stock HAVING p.stock<>movement_stock;

Additional Explanation

This reconciles a stored balance with its movement ledger.

Verified

Option C

DELETE FROM table_name;

Additional Explanation

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

Verified

Option D

SELECT * FROM table_name;

Additional Explanation

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