select w_state
     , i_item_id
     , sum(case
               when (cast(d_date as date) < cast('2000-03-11' 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('2000-03-11' 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 date_sub(cast('2000-03-11' as date), 30)
    and date_add(cast('2000-03-11' as date), 30)
group by w_state, i_item_id
order by w_state, i_item_id limit 100
