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CREATE MATERIALIZED VIEW public.mv_sales
TABLESPACE pg_default
AS
WITH regional_sales AS (
SELECT
region,
SUM(amount) AS total_sales
FROM orders
GROUP BY region
),
top_regions AS (
SELECT region
FROM regional_sales
WHERE total_sales > (SELECT SUM(total_sales) / 10 FROM regional_sales)
)
SELECT
region,
product,
SUM(quantity) AS product_units,
SUM(amount) AS product_sales
FROM orders
WHERE region IN (SELECT region FROM top_regions)
GROUP BY region, product
WITH DATA;
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