u-vote.eu/uvote/sql/qq/select_user_voted_notvoted_overall.sql

SELECT SUM(CASE WHEN uvote_data.user_ID = 15 THEN 1 ELSE 0 END) as voted,
		 SUM(CASE WHEN uvote_data.user_ID = 15 THEN 0 ELSE 1 END) as not_voted FROM uvote_data RIGHT JOIN uvote_votes ON ( uvote_data.poll_ID  = uvote_votes.ID AND uvote_data.user_ID = 15);