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我有以下各表數據庫:與母體MS Access數據結構問題/兒童自連接
BeliefsT
- BeliefID(自動編號)
- 信仰(短文本)
ReasonsToAgreeT
- ArgAgreeID(自動編號)
- ConclusionAID(查找到BeliefsT)
- ReasonToAgreeID(另外一個查找到BeliefsT)
ReasonsToDisagreeT
- ArgDisagreeID(自動編號)
- 結論DID(也是對信仰的查詢)
- ReasonToDisagreeID(另外一個查找到BeliefsT)
問題1:我不能指望一個ConclusionAID已在ReasonsToAgreeT表被選擇的次數。
這是我第一次嘗試:
SELECT BeliefsT.Belief, ReasonsToAgreeT.ReasonToAgreeID, ReasonsToDisagreeT.ReasonToDisagreeID
FROM (BeliefsT
LEFT JOIN ReasonsToAgreeT
ON BeliefsT.BeliefID = ReasonsToAgreeT.ConclusionAID
) LEFT JOIN ReasonsToDisagreeT
ON BeliefsT.BeliefID = ReasonsToDisagreeT.ConclusionDID
GROUP BY BeliefsT.Belief, ReasonsToAgreeT.ReasonToAgreeID, ReasonsToDisagreeT.ReasonToDisagreeID
ORDER BY BeliefsT.Belief;
它只是有點讓你看所有的值,但不會做任何事情......
我也只是看一個表在一段時間,但並沒有真正得到我任何東西:
SELECT ReasonsToAgreeT.ConclusionAID, Count(ReasonsToAgreeT.ReasonToAgreeID) AS CountOfReasonToAgreeID
FROM ReasonsToAgreeT
GROUP BY ReasonsToAgreeT.ConclusionAID;
這是closesest我能,我的報告的數據源,但它計數重複空值,因爲我的關係搞砸:
SELECT BeliefsT.Belief, ReasonsToAgreeT.ReasonToAgreeID, ReasonsToDisagreeT.ReasonToDisagreeID
FROM (BeliefsT
LEFT JOIN ReasonsToAgreeT
ON BeliefsT.BeliefID = ReasonsToAgreeT.ConclusionAID
) LEFT JOIN ReasonsToDisagreeT
ON BeliefsT.BeliefID = ReasonsToDisagreeT.ConclusionDID;
當我既包括同意表的原因和理由不同意表,關係得到全亂了,因爲他們都看同樣的信念表,並試圖做一個跨產品,和一切都搞砸了,我不能準確地計數同意或不同意的原因數量...
請包括有問題的SQL語句,並縮小您的問題,排除非必要的部分。感謝和問候, –
@AlexBell我添加了一些SQL並刪除了我的大圖最終目標,並提到了我最初的問題......我希望這有助於...... – myclob