我有一个雄辩的问题，我想投一个领域作为“浮动”。它是一个聚合值，目前以字符串形式返回，下面是一个查询示例：

$productStats->selectRaw("
    product.id,
    TRIM(product.name) AS item_name,
    SUM(IF(order.order_paid_date BETWEEN '" . $start->timestamp . "' AND '" . $end->timestamp . "' AND order.order_type = 'order' AND (open_count > 0 OR click_count > 0), order_item.total_price, 0)) as revenue,
    COALESCE(CAST(SUM(IF(order.updated_date BETWEEN '" . $start->timestamp . "' AND '" . $end->timestamp . "' AND order.order_type = 'order' AND (open_count > 0 OR click_count > 0), 1, 0)) as SIGNED), 0) / CAST(SUM(IF(order.updated_date BETWEEN '" . $start->timestamp . "' AND '" . $end->timestamp . "' AND order.order_type = 'order', 1, 0)) as SIGNED) AS change_rate
");
``` `revenue` 以及 `change_rate` 当前作为字符串返回，但我希望它们是浮动的。它们是计算出来的值，所以我不能真正地将属性转换添加到模型中。
编辑：我删除了每个评论的小数点。