3451. Reporting: Calculate each product's percentage of total revenue. — Performance

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

In a reporting module, solve this as a production problem using Performance: Calculate each product's percentage of total revenue. Provide the SQL, explain the logic, show safe application integration, and mention failure/edge cases.

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Answer & Explanation

4 Answers

Verified

Option A

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 B

SELECT * FROM table_name;

Additional Explanation

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

Verified

Option C

DELETE FROM table_name;

Additional Explanation

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

Verified Correct Answer

Option D

WITH totals AS (SELECT product_id,SUM(quantity*unit_price) revenue FROM order_items GROUP BY product_id) SELECT product_id,revenue,100*revenue/SUM(revenue) OVER() revenue_pct FROM totals;

Additional Explanation

The window SUM computes the overall total while preserving product-level rows.