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-- or more contributor license agreements.  See the NOTICE file
-- distributed with this work for additional information
-- regarding copyright ownership.  The ASF licenses this file
-- to you under the Apache License, Version 2.0 (the
-- "License"); you may not use this file except in compliance
-- with the License.  You may obtain a copy of the License at
--
--     http://www.apache.org/licenses/LICENSE-2.0
--
-- Unless required by applicable law or agreed to in writing, software
-- distributed under the License is distributed on an "AS IS" BASIS,
-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-- See the License for the specific language governing permissions and
-- limitations under the License.

with ss as (
 select
          i_item_id,sum(ss_ext_sales_price) total_sales
 from
 	store_sales,
 	date_dim,
         customer_address,
         item
 where
         i_item_id in (select
  i_item_id
from
 item
where i_category in ('Children'))
 and     ss_item_sk              = i_item_sk
 and     ss_sold_date_sk         = d_date_sk
 and     d_year                  = 1999
 and     d_moy                   = 9
 and     ss_addr_sk              = ca_address_sk
 and     ca_gmt_offset           = -6 
 group by i_item_id),
 cs as (
 select
          i_item_id,sum(cs_ext_sales_price) total_sales
 from
 	catalog_sales,
 	date_dim,
         customer_address,
         item
 where
         i_item_id               in (select
  i_item_id
from
 item
where i_category in ('Children'))
 and     cs_item_sk              = i_item_sk
 and     cs_sold_date_sk         = d_date_sk
 and     d_year                  = 1999
 and     d_moy                   = 9
 and     cs_bill_addr_sk         = ca_address_sk
 and     ca_gmt_offset           = -6 
 group by i_item_id),
 ws as (
 select
          i_item_id,sum(ws_ext_sales_price) total_sales
 from
 	web_sales,
 	date_dim,
         customer_address,
         item
 where
         i_item_id               in (select
  i_item_id
from
 item
where i_category in ('Children'))
 and     ws_item_sk              = i_item_sk
 and     ws_sold_date_sk         = d_date_sk
 and     d_year                  = 1999
 and     d_moy                   = 9
 and     ws_bill_addr_sk         = ca_address_sk
 and     ca_gmt_offset           = -6
 group by i_item_id)
  select   
  i_item_id
,sum(total_sales) total_sales
 from  (select * from ss 
        union all
        select * from cs 
        union all
        select * from ws) tmp1
 group by i_item_id
 order by i_item_id
      ,total_sales
 limit 100