1135. Repeat customers — Banking — implementation variant 35

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

In a Banking application, implement this production problem: Find customers with at least two completed orders. 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

SELECT * FROM the_table;

Additional Explanation

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

Verified

Option B

UPDATE the_table SET status='active';

Additional Explanation

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

Verified Correct Answer

Option C

SELECT customer_id,COUNT(*) completed_orders FROM orders WHERE status='completed' GROUP BY customer_id HAVING COUNT(*)>=2;

Additional Explanation

HAVING applies the count condition after grouping.

Verified

Option D

DELETE FROM the_table;

Additional Explanation

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