3087. SaaS: Find churned users whose last subscription ended in the last 30 days. — Multi-language REST API

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

In a saas module, solve this as a production problem using Multi-language REST API: Find churned users whose last subscription ended 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

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

Option C

DELETE FROM table_name;

Additional Explanation

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

Verified Correct Answer

Option D

SELECT user_id,MAX(end_date) last_end_date FROM subscriptions GROUP BY user_id HAVING MAX(end_date)>=CURRENT_DATE-INTERVAL 30 DAY AND MAX(end_date)

Additional Explanation

Use the latest subscription end date to identify recent churn.