Question

我得到了以下sql语句：

 $sql4 = "SELECT 
          customers_basket.customers_basket_quantity,
          products.products_price
        From
          products Inner Join
          products_description
            On products.products_id = products_description.products_id Inner Join
          customers_basket On customers_basket.products_id = products.products_id
        Where
          products_description.language_id = '".$lang."' And
          customers_basket.customers_id = '".$cid."'";

现在问题出在sql查询之前，我不知道它会有多少结果。完成查询后我首先需要做的是：

customers_basket.customers_basket_quantity * products.products_price

然后我需要补充一下。所以上面的计算发生在每一行本身。然后我需要相互添加所有结果，所以我得到最终的总价格。我如何在我的PHP甚至MySql中这样做？

我读了这篇帖子Get all mysql selected rows into an array，但它并没有帮助我。

修改

更确切地说：

例如，我的查询给出了以下结果：

customers_basket.customers_basket_quantity | products.products_price 
2                                            5
3                                            4

现在我需要做以下事情：

2 * 5 = 10 
3 * 4 = 12 

10 + 12 = 22

Answer 1

只需您可以像这样更新您的查询：

$sql4 = "SELECT customers_basket.customers_basket_quantity, products.products_price,
          (customers_basket.customers_basket_quantity * products.products_price) as total, (select sum(customers_basket.customers_basket_quantity * products.products_price) from products products  Inner Join
      customers_basket On customers_basket.products_id = products.products_id ) as total_sum
        From
          products Inner Join
          products_description
            On products.products_id = products_description.products_id Inner Join
          customers_basket On customers_basket.products_id = products.products_id
        Where
          products_description.language_id = '".$lang."' And
          customers_basket.customers_id = '".$cid."'";

当你循环结果时，你也可以用php进行求和。

Answer 2

您可以使用SUM：

    "SELECT 
          SUM(customers_basket.customers_basket_quantity * products.products_price) as total
        From
          products Inner Join
          products_description
            On products.products_id = products_description.products_id Inner Join
          customers_basket On customers_basket.products_id = products.products_id
        Where
          products_description.language_id = '".$lang."' And
          customers_basket.customers_id = '".$cid."'";

添加多个SQL结果

2 个答案: