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dmitry-udod/gist:0843685b8235a0692403126e5d300e4a

Created October 6, 2017 07:36
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GROUP BY
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gistfile1.txt
select DISTINCT ON (t.orders) * from (select max(id) id, max(email), max(orders) as orders, campaign_id from coupons group by campaign_id ORDER BY orders DESC) as t ORDER BY t.orders DESC
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