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SELECT
ss_customer_sk,
sum(act_sales) sumsales
FROM (SELECT
ss_item_sk,
ss_ticket_number,
ss_customer_sk,
CASE WHEN sr_return_quantity IS NOT NULL
THEN (ss_quantity - sr_return_quantity) * ss_sales_price
ELSE (ss_quantity * ss_sales_price) END act_sales
FROM store_sales
LEFT OUTER JOIN store_returns
ON (sr_item_sk = ss_item_sk AND sr_ticket_number = ss_ticket_number)
,
reason
WHERE sr_reason_sk = r_reason_sk AND r_reason_desc = 'reason 28') t
GROUP BY ss_customer_sk
ORDER BY sumsales, ss_customer_sk
LIMIT 100
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