541. CTE for monthly sales — CTE task 1

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

Verified

Option A

Use TRUNCATE for the CTE result.

Additional Explanation

This option is incorrect for the stated requirement.

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Option B

Use a correlated DELETE without any filter.

Additional Explanation

This option is incorrect for the stated requirement.

Verified Correct Answer

Option C

WITH monthly_sales AS (SELECT DATE_FORMAT(order_date,'%Y-%m') month,SUM(total_amount) revenue FROM orders WHERE status='completed' GROUP BY DATE_FORMAT(order_date,'%Y-%m')) SELECT * FROM monthly_sales ORDER BY month;

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 D

Use only a CROSS JOIN.

Additional Explanation

This option is incorrect for the stated requirement.