SELECT * FROM (SELECT vi_articoli.*
                FROM vi_articoli 
                WHERE  vi_articoli.code <> 'guide' AND  FIND_IN_SET('-1', id_categorie) AND  vi_articoli.state = '1' AND (vi_articoli.publish_up <= now() OR vi_articoli.publish_up IS NULL) 
                AND (NOW() <= vi_articoli.publish_down OR vi_articoli.publish_down IS NULL)  ORDER BY vi_articoli.data DESC ) tb1  UNION SELECT * FROM (SELECT vi_articoli.*
                FROM vi_articoli 
                WHERE  vi_articoli.state = '1' AND (vi_articoli.publish_up <= now() OR vi_articoli.publish_up IS NULL) 
                AND (NOW() <= vi_articoli.publish_down OR vi_articoli.publish_down IS NULL)  ORDER BY vi_articoli.data DESC ) tb2  LIMIT 23, 1