public function join_select($params, $secondary_table, $join_cond) {
        $query = 'SELECT ';

        foreach($params as $val) {
            $query = $query . '`' . $val . '`, ';
        }
        $query = rtrim($query, ',');

        $query = $query . ' FROM `' . $this->table . '` JOIN `' . $secondary_table . '` ON `' . $this->table . '.' . $join_cond . '` = `' . $secondary_table . '.' . $join_cond . '`';

        $query = $this->prep_exec($query, $params);
        $array = $this->fetchAsArray($query);

        return $array;
    }