WITH
  ss AS (
   SELECT
     "i_manufact_id"
   , "sum"("ss_ext_sales_price") "total_sales"
   FROM
     store_sales
   , date_dim
   , customer_address
   , item
   WHERE ("i_manufact_id" IN (
      SELECT "i_manufact_id"
      FROM
        item
      WHERE ("i_category" IN ('Electronics'))
   ))
      AND ("ss_item_sk" = "i_item_sk")
      AND ("ss_sold_date_sk" = "d_date_sk")
      AND ("d_year" = 1998)
      AND ("d_moy" = 5)
      AND ("ss_addr_sk" = "ca_address_sk")
      AND ("ca_gmt_offset" = -5)
   GROUP BY "i_manufact_id"
) 
, cs AS (
   SELECT
     "i_manufact_id"
   , "sum"("cs_ext_sales_price") "total_sales"
   FROM
     catalog_sales
   , date_dim
   , customer_address
   , item
   WHERE ("i_manufact_id" IN (
      SELECT "i_manufact_id"
      FROM
        item
      WHERE ("i_category" IN ('Electronics'))
   ))
      AND ("cs_item_sk" = "i_item_sk")
      AND ("cs_sold_date_sk" = "d_date_sk")
      AND ("d_year" = 1998)
      AND ("d_moy" = 5)
      AND ("cs_bill_addr_sk" = "ca_address_sk")
      AND ("ca_gmt_offset" = -5)
   GROUP BY "i_manufact_id"
) 
, ws AS (
   SELECT
     "i_manufact_id"
   , "sum"("ws_ext_sales_price") "total_sales"
   FROM
     web_sales
   , date_dim
   , customer_address
   , item
   WHERE ("i_manufact_id" IN (
      SELECT "i_manufact_id"
      FROM
        item
      WHERE ("i_category" IN ('Electronics'))
   ))
      AND ("ws_item_sk" = "i_item_sk")
      AND ("ws_sold_date_sk" = "d_date_sk")
      AND ("d_year" = 1998)
      AND ("d_moy" = 5)
      AND ("ws_bill_addr_sk" = "ca_address_sk")
      AND ("ca_gmt_offset" = -5)
   GROUP BY "i_manufact_id"
) 
SELECT
  "i_manufact_id"
, "sum"("total_sales") "total_sales"
FROM
  (
   SELECT *
   FROM
     ss
UNION ALL    SELECT *
   FROM
     cs
UNION ALL    SELECT *
   FROM
     ws
)  tmp1
GROUP BY "i_manufact_id"
ORDER BY "total_sales" ASC
LIMIT 100
;