SELECT t.id, t.name, t.votes
FROM (
       SELECT r.id, r.name, COUNT(v.id_user) AS votes
       FROM restaurants r,
            user_votes v
       WHERE v.id_restaurant = r.id
         AND v.DATE = ?1
       GROUP BY r.id, r.name
     ) t
WHERE t.votes =
      (SELECT MAX(votes)
       FROM (SELECT COUNT(v2.id_user) AS votes
             FROM user_votes v2
             WHERE v2.DATE = ?1
             GROUP BY v2.id_restaurant))