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-- 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
--
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-- 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.
--

--q78.sql--

 with ws as
   (select d_year AS ws_sold_year, ws_item_sk,
     ws_bill_customer_sk ws_customer_sk,
     sum(ws_quantity) ws_qty,
     sum(ws_wholesale_cost) ws_wc,
     sum(ws_sales_price) ws_sp
    from web_sales
    left join web_returns on wr_order_number=ws_order_number and ws_item_sk=wr_item_sk
    join date_dim on ws_sold_date_sk = d_date_sk
    where wr_order_number is null
    group by d_year, ws_item_sk, ws_bill_customer_sk
    ),
 cs as
   (select d_year AS cs_sold_year, cs_item_sk,
     cs_bill_customer_sk cs_customer_sk,
     sum(cs_quantity) cs_qty,
     sum(cs_wholesale_cost) cs_wc,
     sum(cs_sales_price) cs_sp
    from catalog_sales
    left join catalog_returns on cr_order_number=cs_order_number and cs_item_sk=cr_item_sk
    join date_dim on cs_sold_date_sk = d_date_sk
    where cr_order_number is null
    group by d_year, cs_item_sk, cs_bill_customer_sk
    ),
 ss as
   (select d_year AS ss_sold_year, ss_item_sk,
     ss_customer_sk,
     sum(ss_quantity) ss_qty,
     sum(ss_wholesale_cost) ss_wc,
     sum(ss_sales_price) ss_sp
    from store_sales
    left join store_returns on sr_ticket_number=ss_ticket_number and ss_item_sk=sr_item_sk
    join date_dim on ss_sold_date_sk = d_date_sk
    where sr_ticket_number is null
    group by d_year, ss_item_sk, ss_customer_sk
    )
 select
   ss_sold_year, ss_item_sk, ss_customer_sk,
   round(ss_qty/(coalesce(ws_qty,0)+coalesce(cs_qty,0)),2) ratio,
   ss_qty store_qty, ss_wc store_wholesale_cost, ss_sp store_sales_price,
   coalesce(ws_qty,0)+coalesce(cs_qty,0) other_chan_qty,
   coalesce(ws_wc,0)+coalesce(cs_wc,0) other_chan_wholesale_cost,
   coalesce(ws_sp,0)+coalesce(cs_sp,0) other_chan_sales_price
 from ss
 left join ws on (ws_sold_year=ss_sold_year and ws_item_sk=ss_item_sk and ws_customer_sk=ss_customer_sk)
 left join cs on (cs_sold_year=ss_sold_year and cs_item_sk=ss_item_sk and cs_customer_sk=ss_customer_sk)
 where (coalesce(ws_qty,0)>0 or coalesce(cs_qty, 0)>0) and ss_sold_year=2000
 order by
   ss_sold_year, ss_item_sk, ss_customer_sk,
   ss_qty desc, ss_wc desc, ss_sp desc,
   other_chan_qty,
   other_chan_wholesale_cost,
   other_chan_sales_price,
   round(ss_qty/(coalesce(ws_qty+cs_qty,1)),2)
  limit 100
            
