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-- 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.
--

--q83.sql--

 with sr_items as
  (select i_item_id item_id, sum(sr_return_quantity) sr_item_qty
   from store_returns, item, date_dim
   where sr_item_sk = i_item_sk
      and  d_date in (select d_date from date_dim where d_week_seq in
		      (select d_week_seq from date_dim where d_date in (cast('2000-06-30' as date),cast('2000-09-27' as date),cast('2000-11-17' as date))))
      and sr_returned_date_sk   = d_date_sk
   group by i_item_id),
 cr_items as
  (select i_item_id item_id, sum(cr_return_quantity) cr_item_qty
  from catalog_returns, item, date_dim
  where cr_item_sk = i_item_sk
      and d_date in (select d_date from date_dim where d_week_seq in
		      (select d_week_seq from date_dim where d_date in (cast('2000-06-30' as date),cast('2000-09-27' as date),cast('2000-11-17' as date))))
      and cr_returned_date_sk   = d_date_sk
      group by i_item_id),
 wr_items as
  (select i_item_id item_id, sum(wr_return_quantity) wr_item_qty
  from web_returns, item, date_dim
  where wr_item_sk = i_item_sk and d_date in
      (select d_date	from date_dim	where d_week_seq in
		      (select d_week_seq from date_dim where d_date in (cast('2000-06-30' as date),cast('2000-09-27' as date),cast('2000-11-17' as date))))
    and wr_returned_date_sk = d_date_sk
  group by i_item_id)
 select sr_items.item_id
       ,sr_item_qty
       ,sr_item_qty/(sr_item_qty+cr_item_qty+wr_item_qty)/3.0 * 100 sr_dev
       ,cr_item_qty
       ,cr_item_qty/(sr_item_qty+cr_item_qty+wr_item_qty)/3.0 * 100 cr_dev
       ,wr_item_qty
       ,wr_item_qty/(sr_item_qty+cr_item_qty+wr_item_qty)/3.0 * 100 wr_dev
       ,(sr_item_qty+cr_item_qty+wr_item_qty)/3.0 average
 from sr_items, cr_items, wr_items
 where sr_items.item_id=cr_items.item_id
   and sr_items.item_id=wr_items.item_id
 order by sr_items.item_id, sr_item_qty
 limit 100
            
