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