SQL - 范围之间的左外连接

Question

我需要加入 4 个表才能为每个 AccountID 找到正确的 AccountGroup。

问题是当我尝试在我的加入中使用“between”时，我得到了错误的 AccountGroup 引用。

我有以下表格：

表：帐户

AccountID	AccountDesc
500050	Test

表：AccountDesc

AccountFromID	AccountToID	AccountGroup
500050	500050	OtherCost

表：AccountExtended

AccountID
500050
500050_Seller
500050_Purchaser

表：AccountExtendedDesc

AccountID	AccountGrp1ID	AccountGrp2ID	AccountGroup
500050	500050_Seller	500050_A	CostOfSeller
500050	500050_Purchaser	500050_A	CostOfSeller

问题在于它返回的查询，我的 AccountGroup 错误为 500050，它同时返回了 OtherCost 和 CostOfSeller 的 GroupDescriptions。

表格：结果（错误）

AccountID	AccountDesc
500050	CostOfSeller
500050	OtherCost
500050_Seller	CostOfSeller
500050_Purchaser	CostOfSeller

我只想要

AccountID	AccountDesc
500050	OtherCost
500050_Seller	CostOfSeller
500050_Purchaser	CostOfSeller

我的查询

SELECT AE.AccountID, isnull(A.AccountGroup, Ad.AccountGroup) as AccountGroup FROM 
(
SELECT 
AE.AccountID,
Aed.AccountGroup

FROM Accounts A
RIGHT OUTER JOIN AccountExtended AE on left(AE.AccountID,6)=A.AccountID
LEFT OUTER JOIN AccountExtendedDesc Aed on Aed.AccGrp1ID= A.AccountID
) A

LEFT OUTER JOIN AccountDesc Ad on A.AccountID between Ad.AccountFromID and Ad.AccountToID

Answer 1

我不确定我是否理解每个表之间的关系。我下面的代码假定AccountExtendedDesc 表中的任何内容将基本上覆盖AccountDesc 表中的任何内容。我已经忽略了 Accounts 表，因为我完全不确定它是否需要。

SELECT
    ae.AccountID,
    isnull(aed.AccountGroup, ad.AccountGroup) as AccountGroup
FROM
    AccountExtended ae
    LEFT JOIN AccountDesc ad ON
        ae.AccountID between ad.AccountFromID AND ad.AccountToID
    LEFT JOIN AccountExtendedDesc aed ON
        aed.AccountGrp1ID = ae.AccountID

Answer 2

下面的查询给出了你需要的结果。

SELECT A.AccountID, isnull(A.AccountGroup, Ad.AccountGroup) as AccountGroup FROM 
(SELECT 
AE.AccountID,
Aed.AccountGroup

FROM Accounts A
RIGHT OUTER JOIN AccountExtended AE on left(AE.AccountID,6)=A.AccountID
LEFT OUTER JOIN AccountExtendedDesc Aed on Aed.AccountGrp1ID= AE.AccountID
) A
LEFT OUTER JOIN AccountDesc Ad on A.AccountID between Ad.AccountFromID and Ad.AccountToID