| select store.store_country as c0, time_by_day.the_year as c1, count(distinct sales_fact_1997.customer_id) as m0 from store as store, sales_fact_1997 as sales_fact_1997, time_by_day as time_by_day where sales_fact_1997.store_id = store.store_id and store.store_country = 'USA' and sales_fact_1997.time_id = time_by_day.time_id group by store.store_country, time_by_day.the_year; |