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select
w_state
,i_item_id
,sum(case when (cast(d_date as date) < cast ('1998-04-08' as date))
then cs_sales_price - coalesce(cr_refunded_cash,0) else 0 end) as sales_before
,sum(case when (cast(d_date as date) >= cast ('1998-04-08' as date))
then cs_sales_price - coalesce(cr_refunded_cash,0) else 0 end) as sales_after
from
catalog_sales left outer join catalog_returns on
(cs_order_number = cr_order_number
and cs_item_sk = cr_item_sk)
,warehouse
,item
,date_dim
where
i_current_price between 0.99 and 1.49
and i_item_sk = cs_item_sk
and cs_warehouse_sk = w_warehouse_sk
and cs_sold_date_sk = d_date_sk
and d_date between (cast ('1998-04-08' as date) - 30 days)
and (cast ('1998-04-08' as date) + 30 days)
group by
w_state,i_item_id
order by w_state,i_item_id
limit 100;
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