1562. Find active records by exact key — Logistics — implementation variant 12

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

In a Logistics application, implement this production problem: Fetch active customers for a supplied customer ID. 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 Correct Answer

Option A

SELECT id, name, email, city FROM customers WHERE id = :customer_id AND status = 'active';

Additional Explanation

Use a parameterized predicate. The primary key makes the lookup selective; status is an additional business rule.

Verified

Option B

DELETE FROM the_table;

Additional Explanation

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

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.