1697. 90-day inactive customers — Insurance — implementation variant 47

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

In a Insurance application, implement this production problem: Find customers whose latest order is older than 90 days or who never ordered. The API/service receives user input and must return or modify data safely. Give the SQL solution, explain why it works, and show how the same operation is called from the selected stack.

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Answer & Explanation

4 Answers

Verified

Option A

DELETE FROM the_table;

Additional Explanation

Incorrect: it does not implement the stated business rule and may modify/fetch the wrong rows.

Verified Correct Answer

Option B

SELECT c.id,c.name FROM customers c LEFT JOIN orders o ON o.customer_id=c.id GROUP BY c.id,c.name HAVING MAX(o.order_date)

Additional Explanation

LEFT JOIN includes never-ordered customers; MAX identifies latest activity.

Verified

Option C

SELECT * FROM the_table;

Additional Explanation

Incorrect: it does not implement the stated business rule and may modify/fetch the wrong rows.

Verified

Option D

UPDATE the_table SET status='active';

Additional Explanation

Incorrect: it does not implement the stated business rule and may modify/fetch the wrong rows.