-- Query 5: same as query 1, but with the "rollup" option.

SELECT
    calendar_year_lookup.year,
    outlet_lookup.shop_name,
    SUM(shop_facts.amount_sold) AS total_amount_sold,
    SUM(shop_facts.quantity_sold) AS total_quantity_sold
FROM outlet_lookup
INNER JOIN shop_facts ON shop_facts.shop_code = outlet_lookup.shop_code
INNER JOIN calendar_year_lookup ON shop_facts.week_key = calendar_year_lookup.week_key
-- Note: shop_name must be used here instead of shop_code for NULL to be handled properly.
GROUP BY calendar_year_lookup.year ASC, outlet_lookup.shop_name ASC WITH ROLLUP;