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.
  
  with year_total as (
   select c_customer_id customer_id
         ,c_first_name customer_first_name
         ,c_last_name customer_last_name
         ,d_year as year
         ,max(ss_net_paid) year_total
         ,'s' sale_type
   from customer
       ,store_sales
       ,date_dim
   where c_customer_sk = ss_customer_sk
     and ss_sold_date_sk = d_date_sk
     and d_year in (2001,2001+1)
   group by c_customer_id
           ,c_first_name
           ,c_last_name
           ,d_year
   union all
   select c_customer_id customer_id
         ,c_first_name customer_first_name
         ,c_last_name customer_last_name
         ,d_year as year
         ,max(ws_net_paid) year_total
         ,'w' sale_type
   from customer
       ,web_sales
       ,date_dim
   where c_customer_sk = ws_bill_customer_sk
     and ws_sold_date_sk = d_date_sk
     and d_year in (2001,2001+1)
   group by c_customer_id
           ,c_first_name
           ,c_last_name
           ,d_year
           )
    select 
          t_s_secyear.customer_id, t_s_secyear.customer_first_name, t_s_secyear.customer_last_name
   from year_total t_s_firstyear
       ,year_total t_s_secyear
       ,year_total t_w_firstyear
       ,year_total t_w_secyear
   where t_s_secyear.customer_id = t_s_firstyear.customer_id
           and t_s_firstyear.customer_id = t_w_secyear.customer_id
           and t_s_firstyear.customer_id = t_w_firstyear.customer_id
           and t_s_firstyear.sale_type = 's'
           and t_w_firstyear.sale_type = 'w'
           and t_s_secyear.sale_type = 's'
           and t_w_secyear.sale_type = 'w'
           and t_s_firstyear.year = 2001
           and t_s_secyear.year = 2001+1
           and t_w_firstyear.year = 2001
           and t_w_secyear.year = 2001+1
           and t_s_firstyear.year_total > 0
           and t_w_firstyear.year_total > 0
           and case when t_w_firstyear.year_total > 0 then t_w_secyear.year_total / t_w_firstyear.year_total else null end
             > case when t_s_firstyear.year_total > 0 then t_s_secyear.year_total / t_s_firstyear.year_total else null end
   order by 2,1,3
  limit 100
  