2651. SaaS: Calculate monthly recurring revenue from active plans. — PHP PDO

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

In a saas module, solve this as a production problem using PHP PDO: Calculate monthly recurring revenue from active plans. 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 SUM(amount) mrr FROM subscriptions WHERE status='active' AND billing_cycle='monthly';

Additional Explanation

MRR definitions vary; include only subscriptions matching the organization's recognized recurring-revenue rules.

Verified

Option D

DELETE FROM table_name;

Additional Explanation

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