2394. Messaging: Find conversations with no message in the last 30 days. — Python + FastAPI + SQLAlchemy

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

In a messaging module, solve this as a production problem using Python + FastAPI + SQLAlchemy: Find conversations with no message in the last 30 days. 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 c.id FROM conversations c LEFT JOIN messages m ON m.conversation_id=c.id AND m.created_at>=CURRENT_TIMESTAMP-INTERVAL 30 DAY WHERE m.id IS NULL;

Additional Explanation

Recent-message filtering in the JOIN preserves conversations with no recent activity.

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

SELECT * FROM table_name;

Additional Explanation

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

Verified

Option D

DELETE FROM table_name;

Additional Explanation

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