| select product_class.product_class_id as c0, product_class.product_subcategory as c1 from product as product, product_class as product_class, sales_fact_1997 as sales_fact_1997 where product.product_class_id = product_class.product_class_id and sales_fact_1997.product_id = product.product_id group by product_class.product_class_id, product_class.product_subcategory order by product_class.product_class_id ASC NULLS LAST; |