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Limit results of complex query to most frequent values in given attribute
First one is to go through all of the returns and group them by color and sum the items, return, like below:
select
i.color,
trunc(sum(r.quantity)::numeric / sum(ol.quantity)::numeric, 2) as return_rate … (order_return_items_1.r_q) / sum(order_return_items_1.ol_q)), 3)) DESC NULLS LAST
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