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select asceding.rnk, i1.i_product_name best_performing, i2.i_product_name worst_performing
from(select *
from (select item_sk,rank() over (order by rank_col asc) rnk
from (select ss_item_sk item_sk,avg(ss_net_profit) rank_col
from store_sales ss1
where ss_store_sk = 2
group by ss_item_sk
having avg(ss_net_profit) > 0.9*(select avg(ss_net_profit) rank_col
from store_sales
where ss_store_sk = 2
and ss_hdemo_sk is null
group by ss_store_sk))V1)V11
where rnk < 11) asceding,
(select *
from (select item_sk,rank() over (order by rank_col desc) rnk
from (select ss_item_sk item_sk,avg(ss_net_profit) rank_col
from store_sales ss1
where ss_store_sk = 2
group by ss_item_sk
having avg(ss_net_profit) > 0.9*(select avg(ss_net_profit) rank_col
from store_sales
where ss_store_sk = 2
and ss_hdemo_sk is null
group by ss_store_sk))V2)V21
where rnk < 11) descending,
item i1,
item i2
where asceding.rnk = descending.rnk
and i1.i_item_sk=asceding.item_sk
and i2.i_item_sk=descending.item_sk
order by asceding.rnk
limit 100;
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