轉換交叉表查詢到視圖

Question

我有我想轉換到一個視圖以下查詢：

SELECT 
    PartNum, 
    SUM(IF(DAYOFWEEK(DeliveryDate) = '2', value, NULL)) AS 'Mon', 
    SUM(IF(DAYOFWEEK(DeliveryDate) = '3', value, NULL)) AS 'Tue', 
    SUM(IF(DAYOFWEEK(DeliveryDate) = '4', value, NULL)) AS 'Wed', 
    SUM(IF(DAYOFWEEK(DeliveryDate) = '5', value, NULL)) AS 'Thu', 
    SUM(IF(DAYOFWEEK(DeliveryDate) = '6', value, NULL)) AS 'Fri', 
    SUM(IF(DAYOFWEEK(DeliveryDate) = '7', value, NULL)) AS 'Sat', 
    SUM(IF(DAYOFWEEK(DeliveryDate) = '1', value, NULL)) AS 'Sun', 
    SUM(IF(DeliveryDate > DATE_ADD(CURDATE(),INTERVAL 7 DAY), value, NULL)) AS 'Future' 
FROM (
    SELECT PartNum, DeliveryDate , SUM(Ordered) value FROM v_archived_items_due 
    GROUP BY PartNum, DeliveryDate 
    ) t 
    GROUP BY PartNum; 

當我嘗試將其保存爲一個觀點，我得到以下錯誤：

1349 - Views SELECT contains a subquery in the FROM clause.

該查詢本身工作正常。我怎麼把它變成一個視圖？

Answer 1

MySQL不允許查看子查詢，所以沒有看到任何示例數據，看看如何在沒有subqyery的情況下重做這個。由於這是按預期工作，我會創造你的子查詢的視圖：

create view view1 as 
    SELECT PartNum, DeliveryDate , SUM(Ordered) value 
    FROM v_archived_items_due 
    GROUP BY PartNum, DeliveryDate; 

然後，只需調用查詢這樣的觀點：

SELECT 
    PartNum, 
    SUM(IF(DAYOFWEEK(DeliveryDate) = '2', value, NULL)) AS 'Mon', 
    SUM(IF(DAYOFWEEK(DeliveryDate) = '3', value, NULL)) AS 'Tue', 
    SUM(IF(DAYOFWEEK(DeliveryDate) = '4', value, NULL)) AS 'Wed', 
    SUM(IF(DAYOFWEEK(DeliveryDate) = '5', value, NULL)) AS 'Thu', 
    SUM(IF(DAYOFWEEK(DeliveryDate) = '6', value, NULL)) AS 'Fri', 
    SUM(IF(DAYOFWEEK(DeliveryDate) = '7', value, NULL)) AS 'Sat', 
    SUM(IF(DAYOFWEEK(DeliveryDate) = '1', value, NULL)) AS 'Sun', 
    SUM(IF(DeliveryDate > DATE_ADD(CURDATE(),INTERVAL 7 DAY), value, NULL)) AS 'Future' 
FROM view1 
GROUP BY PartNum; 

Answer 2

Behavoiur作爲設計

http://dev.mysql.com/doc/refman/5.1/en/create-view.html

你必須從你的子查詢中建立一個視圖並使用它。