Question

我正在尝试在我的网站中创建一个统计页面，以显示属于交易者的产品，每种产品的销售量以及已售出的特定产品的总价格。

我的代码目前创建了一个while循环，但是当它循环遍历数据库时，它会多次显示这些项目（而不是每个产品只显示一次），并且每个产品的总量不会被设置对于某种产品，它显示了每种产品的总量。

这是我的选择声明：

      $querytest = "SELECT * FROM PRODUCT
                    INNER JOIN TRADER
                    ON PRODUCT.Stall_ID=TRADER.Stall_ID
                    INNER JOIN ORDER_ITEMS
                    ON PRODUCT.Product_ID=ORDER_ITEMS.Product_ID
                    WHERE TRADER.Username='". $_SESSION['Username'] ."'";

      $testresult = oci_parse($connection, $querytest);
      oci_execute($testresult)

这是我的while循环。我希望它只在数据库中输出一次产品。但它输出了很多次。

    while($row = oci_fetch_assoc($testresult)) {
      $DName = $row ['NAME'];
      $DProdesc = $row ['PRODUCT_DESC'];
      $DIMAGEID = $row['IMAGEID'];
      $DPrice = $row['PRICE'];

      $price = $row['PRICE'];

      $prodord = $row['PRODUCTQUANTITY'];

      $totalprodord = $totalprodord + $prodord;

      $totalprodprice = $totalprodord * $Dprice;

      $quantity = $row['QUANTITY'];

      $subtotal = ($price * $quantity);

      $total = $total + $subtotal;

      $stock = $stock + $quantity;





            echo  '<td> <img src="' . $DIMAGEID.  '" height="50" width="50"/></td>';
            echo  '<td>' .$DName. '</td>';
            echo  '<td>' .$DProdesc. '</td>';
            echo '<td>' .$totalprodord. '</td>';
            echo '<td>&pound; ' .$DPrice.  '</td>';
                  echo '<td>&pound; ' . $totalprodprice . '</td>';'</tr>';
    }


      ob_flush();
      ?>

我的数据库表：

CREATE TABLE TRADER(
    Trader_ID number (5) NOT NULL,
    Trader_Name varchar2 (20),
    FirstName varchar2 (10) NOT NULL,
    LastName varchar2 (10) NOT NULL,
    DOB date NOT NULL,
    Username varchar2 (15) NOT NULL,
    Password varchar2 (32) NOT NULL,
    Phone varchar2 (10),
    Email varchar2 (30) NOT NULL,
    Stall_ID number (5) references STALL(Stall_ID),
    Primary Key (Trader_ID));

CREATE TABLE PRODUCT(
    Product_ID number (5) NOT NULL,
    Name varchar2 (30) NOT NULL,
    Product_Desc varchar2 (50),
    ImageID varchar2 (35),
    Price number(5,2) NOT NULL,
    Quantity number (10) NOT NULL,
    Stall_ID number (5) references STALL(Stall_ID),
    Product_Type_ID number (5) references PRODUCT_TYPE(Product_Type_ID),
    Primary Key (Product_ID));

CREATE TABLE ORDER_ITEMS(
    Order_Items_ID number (5) NOT NULL,
    TotalPrice number (5,2) NOT NULL,
    ProductQuantity number (5) NOT NULL,
    Day_ID number (5) references COLLECTION_DAY(Day_ID),
    Time_ID number (5) references COLLECTION_TIME(Time_ID),
    Customer_ID number (5) references CUSTOMER(Customer_ID),
    Product_ID number (5) references PRODUCT(Product_ID),
    Order_ID number (5) references CUSTOMER_ORDER(Order_ID),
    Primary Key (Order_Items_ID));

有人可以帮助我正确显示统计数据吗？

由于

Answer 1

您需要在查询中总结您的数字，或者您必须在代码中总结数字并跳过相同的产品。你两个都没做。

尝试使用以下内容替换您的查询：

SELECT prod.product_id, prod.name, 
prod.quality-sum(orders.quality) AS Stock_Left, 
AVG(orders.price) AS Sold_price, 
SUM(orders.price * orders.quality) AS Sold_Amount, 
Sum(orders.quality) AS Total_Sold 
FROM product prod INNER JOIN Order_Items orders
ON prod.prod_id = orders.prod_id 
INNER JOIN trader 
ON prod.stall_id = trader.stall_id
WHERE trader.Username='". $_SESSION['Username'] ."'"

你可以在循环中摆脱大部分计算。

创建统计信息页面。腓

1 个答案: