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--
--     http://www.apache.org/licenses/LICENSE-2.0
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select i_item_desc
      ,i_category
      ,i_class
      ,i_current_price
      ,sum(ss_ext_sales_price) as itemrevenue
      ,sum(ss_ext_sales_price)*100/sum(sum(ss_ext_sales_price)) over
          (partition by i_class) as revenueratio
from
	store_sales
    	,item
    	,date_dim
where
	ss_item_sk = i_item_sk
  	and i_category in ('Jewelry', 'Sports', 'Books')
  	and ss_sold_date_sk = d_date_sk
	and d_date between cast('2001-01-12' as date)
				and (cast('2001-01-12' as date) + interval '30' day)
group by
	i_item_id
        ,i_item_desc
        ,i_category
        ,i_class
        ,i_current_price
order by
	i_category
        ,i_class
        ,i_item_id
        ,i_item_desc
        ,revenueratio