    public static function delParam($param, $post_id)
    {
        $sql = "DELETE FROM `posts_param` WHERE `post_id` = '{$post_id}' AND `param` = '{$param}' LIMIT 1";
        $q = Db::query($sql);
        if ($q) {
            return true;
        } else {
            return false;
        }
    }
The software constructs all or part of an SQL command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended SQL command when it is sent to a downstream component.