text: --
  -- Licensed to the Apache Software Foundation (ASF) under one 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.
  --
  
  --q40.sql--
  
   select
     w_state
    ,i_item_id
    ,sum(case when (cast(d_date as date) < cast('2000-03-11' as date))
   		then cs_sales_price - coalesce(cr_refunded_cash,0) else 0 end) as sales_before
    ,sum(case when (cast(d_date as date) >= cast('2000-03-11' as date))
   		then cs_sales_price - coalesce(cr_refunded_cash,0) else 0 end) as sales_after
   from
     catalog_sales left outer join catalog_returns on
         (cs_order_number = cr_order_number
          and cs_item_sk = cr_item_sk)
    ,warehouse, item, date_dim
   where
       i_current_price between 0.99 and 1.49
   and i_item_sk          = cs_item_sk
   and cs_warehouse_sk    = w_warehouse_sk
   and cs_sold_date_sk    = d_date_sk
   and d_date between (cast('2000-03-11' as date) - interval '30' day)
                  and (cast('2000-03-11' as date) + interval '30' day)
   group by w_state,i_item_id
   order by w_state,i_item_id
   limit 100
              
  