3604. Support: Find customers with three or more reopened tickets. — Concurrency

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

In a support module, solve this as a production problem using Concurrency: Find customers with three or more reopened tickets. 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

SELECT * FROM table_name;

Additional Explanation

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

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 Correct Answer

Option C

SELECT customer_id,COUNT(*) reopened_count FROM tickets WHERE status='reopened' GROUP BY customer_id HAVING COUNT(*)>=3;

Additional Explanation

HAVING applies the threshold after grouping.

Verified

Option D

DELETE FROM table_name;

Additional Explanation

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