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我正在嘗試製作所有項目的彙總表。我有一個包含10個用戶的原始數據表,他們分別具有不同的項目。有最多3個不同的項目,我想做一個計數,看看每個人有多少項目。以下是我的代碼。MS Access SQL左連接全部給出0
Select b.Country,b.UserID,Num_including_fruits, Apple,Orange
from
(((SELECT o.Country,o.UserID, IIF(ISNULL(Count(o.UserID)),0,Count(o.UserID))
AS Num_including_fruits
FROM [SEA2_View] as o
GROUP BY o.UserID, o.Country
ORDER BY Country)as b
LEFT JOIN
(SELECT o.Country,o.UserID,IIF(ISNULL(Count(o.UserID)),0,Count(o.UserID)
AS Apple
FROM [APAC2_View] as o
WHERE o.fruit_status <>"fresh" AND o.HWType = "Apple"
GROUP BY o.Country,o.UserID)as d
ON (b.UserID = d.UserID))
LEFT JOIN
(SELECT o.Country,o.UserID,IIF(ISNULL(Count(o.UserID)),0,Count(o.UserID))
AS Orange
FROM [SEA2_View] as o
WHERE o.fruit_status <>"fresh" AND o.HWType = "Orange"
GROUP BY o.Country,o.UserID)as e
ON (d.UserID = e.UserID))
;
第一次連接返回正確的結果,但第二次連接返回所有0,這是不正確的。所以請幫忙!如果涉及到SQL連接,我將不勝感激任何有關最佳實踐的建議。非常感謝!