使用連接和嵌套查詢計數數量

Question

我試圖計算存儲在xcart_order_details中的活動銷售訂單中的庫存數量。我也只希望從x天內訂單中處理'P'或排隊'Q'狀態的股票以及股票類型與某些地點匹配的股票數量; C1股票，C2股票等等。

這在過去的xcart數據庫中過去比較簡單;

SELECT COUNT(`amount`) 
FROM `xcart_order_details` 
WHERE `productid` IN (
    SELECT `productid` 
    FROM `xcart_products` WHERE `orderid` IN 
    (SELECT `orderid` 
    FROM `xcart_orders` 
    WHERE `date` > ".$date_range." 
     AND (`status` = 'P' 
      OR `status` = 'Q')) 
    AND (LOWER(param01) = 'c1 stock' 
     OR LOWER(param01) = 'c2 stock' 
     OR LOWER(param01) = 'g stock' 
     OR LOWER(param01) = 'stock') 
    AND `productid` = ".$safe_prodid.") 

此查詢的工作。但是現在我們的庫存位置存儲在另一個名爲xcart_extra_field_values的表中，並且必須在fieldid = 5的位置檢索;

我試過使用連接從xcart_extra_field_values中獲取值字段，其中fieldid = 5，並嘗試執行我正在處理的上述查詢，但它不起作用。

SELECT COUNT(`a.amount`) 
FROM xcart_order_details a, 
    xcart_extra_field_values b 
WHERE a.productid IN (
    SELECT productid 
    FROM xcart_products WHERE orderid IN 
    (SELECT orderid 
    FROM xcart_orders 
    WHERE date > 1409529600 
     AND (status = 'P' 
      OR status = 'Q')) 
    AND (LOWER(b.value) = 'c1 stock' 
     OR LOWER(b.value) = 'c2 stock' 
     OR LOWER(b.value) = 'g stock' 
     OR LOWER(b.value) = 'stock') 
    AND (a.productid = b.productid) 
    AND (a.productid = 4169) 
    AND (b.fieldid = 5) 

遺憾的是此查詢不工作，我知道這是一個語法問題，但我得到的錯誤是沒有任何幫助。

任何人都可以闡明我做錯了什麼？

Answer 1

您缺少如何連接兩個表的條​​件。我們假設表xcart_extra_field_values中有一個xcart_order_details_id，然後使用它。

畢竟，你甚至不需要加入。你想從xcart_order_details結果，其中某些細節值的記錄存在：

SELECT COUNT(`amount`) 
FROM `xcart_order_details` 
WHERE `productid` IN 
(
    SELECT `productid` 
    FROM `xcart_products` 
    WHERE `orderid` IN 
    (
    SELECT `orderid` 
    FROM `xcart_orders` 
    WHERE `date` > ".$date_range." 
    AND `status` IN ('P','Q') 
) 
AND `productid` = ".$safe_prodid." 
AND EXISTS 
(
    SELECT * 
    FROM xcart_extra_field_values v 
    WHERE v.xcart_order_details_id = xcart_order_details.id 
    AND fieldid = 5 
    AND LOWER(param01) IN ('c1 stock','c2 stock','g stock','stock') 
); 

BTW：你看看有多少人爲了詳細記錄有多少？

Answer 2

已解決。

SELECT COUNT(a.amount) 
FROM xcart_order_details a, 
    xcart_extra_field_values b 
WHERE a.productid IN 
    (SELECT productid 
    FROM xcart_products 
    WHERE orderid IN 
     (SELECT orderid 
      FROM xcart_orders 
      WHERE date > 1409529600 
      AND (status = 'P' 
       OR status = 'Q')) 
     AND (LOWER(b.value) = 'c1 stock' 
      OR LOWER(b.value) = 'c2 stock' 
      OR LOWER(b.value) = 'g stock' 
      OR LOWER(b.value) = 'stock')) 
     AND (a.productid = b.productid) 
     AND (a.productid = 4169) 
     AND (b.fieldid = 5) 

首先，我在我的查詢的末尾缺少一個支架，因爲我是嵌套在兩個IN查詢，我需要COUNT內刪除重音符圍繞a.amount，它不喜歡。當我並排查看我的問題時，我只注意到丟失的支架。

編輯：將我的連接移動到嵌套的IN子句之外，因爲嵌套它是沒有意義的。