3042. Fraud detection: Find multiple accounts sharing the same phone number. — Multi-language REST API

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

In a fraud detection module, solve this as a production problem using Multi-language REST API: Find multiple accounts sharing the same phone number. 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.

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Option B

SELECT * 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

SELECT phone,COUNT(*) cnt FROM accounts WHERE phone IS NOT NULL GROUP BY phone HAVING COUNT(*)>1;

Additional Explanation

Duplicate identity signals can be investigated as part of fraud/risk controls.

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Option D

DELETE FROM table_name;

Additional Explanation

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