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

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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.
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Questions & Answers

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.
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Editorial Answer 1
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.
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Editorial Answer 2
Verified

Option C

DELETE FROM table_name;
Additional Explanation
Incorrect: it does not satisfy the stated business rule and can return/change unintended data.
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Editorial Answer 3
Verified

Option D

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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Editorial Answer 4