C# 在MS Access中，左连接未返回记录

我最近的项目我有一个打印应收账款摘要的要求。我需要返回

OpeningBalance

表中的整行以及

VoucherHeader

和

Customers

中的匹配行

我的SQL查询如下

SELECT 
    OpeningBalance.OpenID, Sum(OpeningBalance.Amount) AS SumOfAmount,  
    Sum(VoucherHeader.Debit) AS SumOfDebit, Sum(VoucherHeader.Credit) AS SumOfCredit, 
    Customers.CustomerID, Customers.CustomerName 
FROM 
   (OpeningBalance 
LEFT OUTER JOIN 
   VoucherHeader ON OpeningBalance.OpenID = VoucherHeader.LedgerID) 
INNER JOIN 
   Customers ON OpeningBalance.OpenID = Customers.CustomerID
WHERE 
   (((Customers.CustomerType)='Debtor') 
     AND ((VoucherHeader.VoucherDate)<#2013/06/02#))
GROUP BY 
    OpeningBalance.OpenID, Customers.CustomerID, Customers.CustomerName, 
    VoucherHeader.LedgerID
ORDER BY 
    Customers.CustomerName;

选择
OpeningBalance.OpenID，总和（OpeningBalance.Amount）为SumOfAmount，
金额（VoucherHeader.Debit）作为利息之和，金额（VoucherHeader.Credit）作为信用之和，
Customers.CustomerID，Customers.CustomerName
从…起
（打开天平
左外连接
OpeningBalance.OpenID=VoucherHeader.LedgerID上的VoucherHeader）
内连接
OpeningBalance.OpenID=Customers.CustomerID上的客户
哪里
（（Customers.CustomerType）=“债务人”）
和（（VoucherHeader.VoucherDate）
选择OB.OpenID，Sum（OB.Amount）作为SumOfAmount，
金额（VB.借方）为利息之和，金额（VB.贷方）为信用之和，CS.客户ID，
来自OpeningBalance OB的CS.CustomerName
OB.OpenID=VB.LedgerID上的左外部联接VoucherHeader VB
在OB.OpenID=CS.CustomerID上左外部加入客户CS
其中（（CS.CustomerType）=“债务人”）和（（VB.VoucherDate）有什么问题？请描述您希望实现的目标以及这些表之间的关系。
SELECT OB.OpenID, Sum(OB.Amount) AS SumOfAmount,  
Sum(VB.Debit) AS SumOfDebit, Sum(VB.Credit) AS SumOfCredit, CS.CustomerID,
CS.CustomerName FROM OpeningBalance OB 
LEFT OUTER JOIN VoucherHeader VB ON OB.OpenID = VB.LedgerID
LEFT OUTER JOIN Customers CS ON OB.OpenID =   CS.CustomerID
WHERE (((CS.CustomerType)='Debtor') AND ((VB.VoucherDate)<#2013/06/02#))
GROUP BY OB.OpenID, CS.CustomerID, CS.CustomerName, VB.LedgerID
ORDER BY CS.CustomerName;