846. Avoid SELECT * in API — performance case 2

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

Write the MySQL query/DDL and explain the performance-sensitive choice. Consider WHERE/JOIN/ORDER BY usage and write overhead.

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Answer & Explanation

4 Answers

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Option A

Add an index to every column without checking workload.

Additional Explanation

This option is incorrect for the stated requirement.

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Option B

Wrap the indexed column in a function unnecessarily.

Additional Explanation

This option is incorrect for the stated requirement.

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Option C

Use OFFSET 999999 for every large-page request.

Additional Explanation

This option is incorrect for the stated requirement.

Verified Correct Answer

Option D

SELECT id,name,price FROM products WHERE status='active' LIMIT 50;

Additional Explanation

Correct implementation. Prefer parameterized queries in application code, validate affected rows for UPDATE/DELETE, and use transactions for related writes.