TPC-DS Q56

WITH ss AS (
  SELECT
    i_item_id AS i_item_id,
    SUM(ss_ext_sales_price) AS total_sales
  FROM store_sales, date_dim, customer_address, item
  WHERE
    i_item_id IN (
      SELECT
        i_item_id
      FROM item
      WHERE
        i_color IN ('peru', 'black', 'green')
    )
    AND ss_item_sk = i_item_sk
    AND ss_sold_date_sk = d_date_sk
    AND d_year = 1999
    AND d_moy = 6
    AND ss_addr_sk = ca_address_sk
    AND ca_gmt_offset = -6
  GROUP BY
    i_item_id
), cs AS (
  SELECT
    i_item_id AS i_item_id,
    SUM(cs_ext_sales_price) AS total_sales
  FROM catalog_sales, date_dim, customer_address, item
  WHERE
    i_item_id IN (
      SELECT
        i_item_id
      FROM item
      WHERE
        i_color IN ('peru', 'black', 'green')
    )
    AND cs_item_sk = i_item_sk
    AND cs_sold_date_sk = d_date_sk
    AND d_year = 1999
    AND d_moy = 6
    AND cs_bill_addr_sk = ca_address_sk
    AND ca_gmt_offset = -6
  GROUP BY
    i_item_id
), ws AS (
  SELECT
    i_item_id AS i_item_id,
    SUM(ws_ext_sales_price) AS total_sales
  FROM web_sales, date_dim, customer_address, item
  WHERE
    i_item_id IN (
      SELECT
        i_item_id
      FROM item
      WHERE
        i_color IN ('peru', 'black', 'green')
    )
    AND ws_item_sk = i_item_sk
    AND ws_sold_date_sk = d_date_sk
    AND d_year = 1999
    AND d_moy = 6
    AND ws_bill_addr_sk = ca_address_sk
    AND ca_gmt_offset = -6
  GROUP BY
    i_item_id
)
SELECT
TOP 100
  i_item_id,
  SUM(total_sales) AS total_sales
FROM (
  SELECT
    *
  FROM ss
  UNION ALL
  SELECT
    *
  FROM cs
  UNION ALL
  SELECT
    *
  FROM ws
) AS tmp1
GROUP BY
  i_item_id
ORDER BY
  total_sales,
  i_item_id;