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.
  --
  
  --q20.sql--
  
  select i_item_id, i_item_desc
         ,i_category
         ,i_class
         ,i_current_price
         ,sum(cs_ext_sales_price) as itemrevenue
         ,sum(cs_ext_sales_price)*100/sum(sum(cs_ext_sales_price)) over
             (partition by i_class) as revenueratio
   from catalog_sales, item, date_dim
   where cs_item_sk = i_item_sk
     and i_category in ('Sports', 'Books', 'Home')
     and cs_sold_date_sk = d_date_sk
   and d_date between cast('1999-02-22' as date)
   				and (cast('1999-02-22' as date) + interval '30' day)
   group by i_item_id, i_item_desc, i_category, i_class, i_current_price
   order by i_category, i_class, i_item_id, i_item_desc, revenueratio
   limit 100
              
  