2892. Orders: Find customers who ordered in every month of a specified quarter. — C# ASP.NET + ADO.NET

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

In a orders module, solve this as a production problem using C# ASP.NET + ADO.NET: Find customers who ordered in every month of a specified quarter. 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

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 B

SELECT * FROM table_name;

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 FROM orders WHERE order_date>=:quarter_start AND order_date<:quarter_end GROUP BY customer_id HAVING COUNT(DISTINCT DATE_FORMAT(order_date,'%Y-%m'))=3;

Additional Explanation

COUNT(DISTINCT month) checks coverage of all three months.

Verified

Option D

DELETE FROM table_name;

Additional Explanation

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