MYSQL中的乘法，除法和加法

Question

我正在運行A-B測試以查看哪種風格的頁面可能獲得更多產品訂單，並試圖將一個頁面稱爲比其他頁面「更好」，因爲它更頻繁地顯示。

我在我的MYSQL數據庫中有8列。

1. Orders_Page_One
2. Orders_Page_Two
3. Orders_Page_Three
4. Visitors_Page_One
5. Visitors_Page_Two
6. Visitors_Page_Three
7. Total_Orders
8. Total_Visitors

目前我只運行一個查詢爲：

$result = mysql_query("SELECT *, (Total_Orders/Total_Visitors) AS order_percent FROM orders WHERE category = clothes ORDER BY order_percent DESC LIMIT 5") or die(mysql_error()); 

這工作，但

這讓我顯示哪些訂單是最流行的，但沒有考慮到他們出現的頁面上。

我曾嘗試：

$result = mysql_query("SELECT *, (Orders_Page_One/Visitors_Page_One) + (Orders_Page_Two/Visitors_Page_Two) + (Orders_Page_Three/Visitors_Page_Three) AS order_percent FROM orders WHERE category = clothes ORDER BY order_percent DESC LIMIT 5") or die(mysql_error()); 

但這似乎並沒有給予準確的結果。

我也試過

$result = mysql_query("SELECT *, ((Orders_Page_One/Visitors_Page_One) + (Orders_Page_Two/Visitors_Page_Two) + (Orders_Page_Three/Visitors_Page_Three)) AS order_percent FROM orders WHERE category = clothes ORDER BY order_percent DESC LIMIT 5") or die(mysql_error()); 

但是，這給出了一個語法錯誤。

假設：

Orders Page One = 10 and Visitors Page One = 20 
Orders Page Two = 10 and Visitors Page Two = 40 
Orders Page Three = 10 and Visitors Page Three = 50 

的數學結果我想應該是：

(10/20) + (10/40) + (10/50) 

OR

0.5 + 0.25 + 0.20 = 0.95 

有什麼建議？我想我只是沒有正確設置數學。

經過閱讀中，我想我會需要使用多個選擇：

IE：

    Select (orders_page_1/visitors_page_1) as order_percent_1 from orders 
    Select (orders_page_2/visitors_page_2) as order_percent_2 from orders 
    Select (orders_page_3/visitors_page_3) as order_percent_3 from orders 
    Select (order_percent_1 + order_percent_two + order_percent_3) as order_percent 
    WHERE category = clothes 
    ORDER BY order_percent DESC 

，但不知道在格式化？或者如果這可行？

$result = mysql_query(" 

SELECT * FROM orders, (
    SELECT (orders_page_1/visitors_page_one) AS ord1 FROM orders WHERE category = 'clothing' ORDER BY ord1 DESC LIMIT 2) AS ord_1, 
     (
    SELECT (orders_page_2/visitors_page_two) AS ord2 FROM orders WHERE category = 'clothing' ORDER BY ord2 DESC LIMIT 2) AS ord_2, 
     (
    SELECT (orders_page_3/visitors_page_3) AS ord3 FROM orders WHERE category = 'clothing' ORDER BY ord3 DESC LIMIT 2) AS ord_3, 

    ORDER BY (ord_1 +ord_2 + ord_3) DESC LIMIT 2") or die(mysql_error()); 

然而，這是給錯誤：

您的SQL語法錯誤;檢查對應於你的MySQL服務器版本的在線使用近 'ORDER BY（ord_1 + ord_2 + ord_3）DESC LIMIT 2' 正確的語法手冊8

Answer 1

一個可能的問題是，

WHERE category = clothes 

應該真的是

WHERE category = 'clothes' 

現在試一下，看看你得到什麼。