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Expression #2 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'btbgnet_btbg.d.id' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by
SELECT d.label, d.id, (SELECT (SUM(selection)/COUNT(*)) FROM vote_users WHERE tp='article' AND vote=d.id) AS raiting FROM data d, vote_users v WHERE v.tp='article' AND d.id=v.vote GROUP BY d.label ORDER BY raiting DESC