text: --q56.sql--
  
   with ss as (
   select i_item_id,sum(ss_ext_sales_price) total_sales
   from
   	  store_sales, date_dim, customer_address, item
   where
      i_item_id in (select i_item_id from item where i_color in ('slate','blanched','burnished'))
   and     ss_item_sk              = i_item_sk
   and     ss_sold_date_sk         = d_date_sk
   and     d_year                  = 2001
   and     d_moy                   = 2
   and     ss_addr_sk              = ca_address_sk
   and     ca_gmt_offset           = -5
   group by i_item_id),
   cs as (
   select i_item_id,sum(cs_ext_sales_price) total_sales
   from
   	  catalog_sales, date_dim, customer_address, item
   where
      i_item_id in (select i_item_id from item where i_color in ('slate','blanched','burnished'))
   and     cs_item_sk              = i_item_sk
   and     cs_sold_date_sk         = d_date_sk
   and     d_year                  = 2001
   and     d_moy                   = 2
   and     cs_bill_addr_sk         = ca_address_sk
   and     ca_gmt_offset           = -5
   group by i_item_id),
   ws as (
   select i_item_id,sum(ws_ext_sales_price) total_sales
   from
   	  web_sales, date_dim, customer_address, item
   where
      i_item_id in (select i_item_id from item where i_color in ('slate','blanched','burnished'))
   and     ws_item_sk              = i_item_sk
   and     ws_sold_date_sk         = d_date_sk
   and     d_year                  = 2001 
   and     d_moy                   = 2
   and     ws_bill_addr_sk         = ca_address_sk
   and     ca_gmt_offset           = -5
   group by i_item_id)
   select i_item_id ,sum(total_sales) total_sales
   from  (select * from ss
          union all
          select * from cs
          union all
          select * from ws) tmp1
   group by i_item_id
   order by total_sales
   limit 100
              
  