左连接sql

<?php
public function sumZong($id){
        $sql ='
            SELECT
                *
            FROM
                vvt_league_user AS p
            Left join vvt_league AS r ON p.league_id = r.id
            Left join vvt_league_invest_sum AS n ON r.id = n.league_id
            WHERE
                p.status = 1
            AND
                r.status = 1
            AND
                p.user_id ='. $id
            ;
        $res = $this ->query($sql);
        return $res;
}
?>