--q97.sql--

 with ssci as (
 select ss_customer_sk customer_sk, ss_item_sk item_sk
 from store_sales,date_dim
 where ss_sold_date_sk = d_date_sk
   and d_month_seq between 1200 and 1200 + 11
 group by ss_customer_sk, ss_item_sk),
 csci as(
  select cs_bill_customer_sk customer_sk, cs_item_sk item_sk
 from catalog_sales,date_dim
 where cs_sold_date_sk = d_date_sk
   and d_month_seq between 1200 and 1200 + 11
 group by cs_bill_customer_sk, cs_item_sk)
 select sum(case when ssci.customer_sk is not null and csci.customer_sk is null then 1 else 0 end) store_only
       ,sum(case when ssci.customer_sk is null and csci.customer_sk is not null then 1 else 0 end) catalog_only
       ,sum(case when ssci.customer_sk is not null and csci.customer_sk is not null then 1 else 0 end) store_and_catalog
 from ssci full outer join csci on (ssci.customer_sk=csci.customer_sk
                                and ssci.item_sk = csci.item_sk)
 limit 100