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 ('2000-06-30', '2000-09-27', '2000-11-17')))
            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 ('2000-06-30', '2000-09-27', '2000-11-17')))
            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 ('2000-06-30', '2000-09-27', '2000-11-17')))
            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
