3143. Financial reconciliation: Find payments whose amount does not match the successful payment total for an order. — Production Debugging

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

In a financial reconciliation module, solve this as a production problem using Production Debugging: Find payments whose amount does not match the successful payment total for an order. Provide the SQL, explain the logic, show safe application integration, and mention failure/edge cases.

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Answer & Explanation

4 Answers

Verified Correct Answer

Option A

SELECT o.id,o.total_amount,COALESCE(SUM(CASE WHEN p.status='success' THEN p.amount ELSE 0 END),0) paid_amount FROM orders o LEFT JOIN payments p ON p.order_id=o.id GROUP BY o.id,o.total_amount HAVING ABS(o.total_amount-paid_amount)>0.01;

Additional Explanation

Aggregate successful payments and compare them with the order total using a tolerance for decimal arithmetic.

Verified

Option B

DELETE FROM table_name;

Additional Explanation

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

Verified

Option C

UPDATE table_name SET status='active';

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.