2527. Migration checksum: Compare aggregate totals between source and target orders. — Laravel Eloquent

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

In a migration checksum module, solve this as a production problem using Laravel Eloquent: Compare aggregate totals between source and target orders. Provide the SQL, explain the logic, show safe application integration, and mention failure/edge cases.

Looking for the latest Sarkari Result 2026 updates? Check the latest government exam results, merit lists and result updates on Sarkari Resultess.

Answer & Explanation

4 Answers

Verified Correct Answer

Option A

SELECT (SELECT COALESCE(SUM(total_amount),0) FROM source_orders) source_total,(SELECT COALESCE(SUM(total_amount),0) FROM target_orders) target_total;

Additional Explanation

Aggregate reconciliation can detect broad migration differences but does not prove every row matches.

Verified

Option B

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 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.