577. CTE update — CTE task 4

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

Write a MySQL 8.0 CTE query for this task. Prefer a readable CTE over a deeply nested subquery when it improves clarity.

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Answer & Explanation

4 Answers

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Option A

Use a correlated DELETE without any filter.

Additional Explanation

This option is incorrect for the stated requirement.

Verified Correct Answer

Option B

WITH low_stock AS (SELECT id FROM products WHERE stock < 5) UPDATE products SET status='low_stock' WHERE id IN (SELECT id FROM low_stock);

Additional Explanation

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

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Option C

Use TRUNCATE for the CTE result.

Additional Explanation

This option is incorrect for the stated requirement.

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Option D

Use only a CROSS JOIN.

Additional Explanation

This option is incorrect for the stated requirement.