Mysql-forespørgsel med mysql-variabel virker ikke i Zend Framework 1

Det ser ud til, at indstilling af en variabel i MySql betragtes som en separat forespørgsel. (fetch*() kan ikke håndtere flere opkald)

så for dem med denne type problemer:

$db->query("SET @rank = 0 ;");

$db->fetchAll("SELECT
                                   @rank := @rank +1 AS rank,
                                    SUM(user_scoring_data.user_points)  AS user_points,
                                    league_team.user_id

                                FROM league_team 
                                RIGHT JOIN user_scoring_data ON league_team.league_team_id = user_scoring_data.league_team_id

                                WHERE league_id = '$league_id' GROUP BY user_scoring_data.league_team_id 
                                ORDER BY user_points DESC"
                            );