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GCP Professional Data Engineer Practice Question

Your retail analytics team created the following materialized view to speed up regional sales dashboards:

CREATE MATERIALIZED VIEW analytics.mv_sales_by_region
AS
SELECT
  region,
  SUM(sales_amount) AS total_sales
FROM analytics.fact_sales
GROUP BY region;

Business-intelligence tools continue to run SQL directly against the base table analytics.fact_sales. Which of the following ad-hoc queries can BigQuery's optimizer transparently rewrite to read only from analytics.mv_sales_by_region, avoiding a full scan of fact_sales without you changing any dashboard code?

  • SELECT region, SUM(sales_amount) FROM analytics.fact_sales WHERE order_channel = 'ONLINE' GROUP BY region;

  • SELECT region, AVG(sales_amount) AS avg_sales FROM analytics.fact_sales GROUP BY region;

  • SELECT region, SUM(sales_amount) FROM analytics.fact_sales GROUP BY region;

  • SELECT region, COUNT(*) AS order_count, SUM(sales_amount) FROM analytics.fact_sales GROUP BY region;

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