2673. Performance: Use keyset pagination for a large descending order list. — PHP PDO

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

In a performance module, solve this as a production problem using PHP PDO: Use keyset pagination for a large descending order list. Provide the SQL, explain the logic, show safe application integration, and mention failure/edge cases.

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Answer & Explanation

4 Answers

Verified Correct Answer

Option A

SELECT id,total_amount,order_date FROM orders WHERE (order_date,id)<(:last_date,:last_id) ORDER BY order_date DESC,id DESC LIMIT 50;

Additional Explanation

The composite cursor preserves deterministic ordering and avoids deep OFFSET scans.

Verified

Option B

DELETE FROM table_name;

Additional Explanation

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

Verified

Option C

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 D

SELECT * FROM table_name;

Additional Explanation

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