Question

我有12个位置，每个位置都运行自己的数据库。每个数据库都设置完全相同，具有自己的信息。数据库都是SQL2005或2008服务器。我写了一个多表查询，以获取支付销售佣金的信息。此查询适用于12个数据库中的10个，其他2个数据库不返回任何结果。如果我使用2个连接表运行查询（在2个数据库上它不起作用）它可以工作，但是其他表格与“where”语句无关。任何人都可以解释为什么它不适用于2005年的2个服务器数据库，如果它适用于所有其他数据库？我的代码是：

SELECT        Customers.sBarcode AS Barcode, Customers.dtCreated AS Created, CustomerUnlimitedTransactions.sCreatedBy AS [Commission pays], 
                         Surcharges.sDescription AS [Unlimited Package], Surcharges.dblCommission AS [Commission Amount], Users.sUserName AS Greeter, @startdate AS Start_Date, 
                         @enddate AS End_Date
FROM            CustomerUnlimitedTransactions INNER JOIN
                         Customers ON CustomerUnlimitedTransactions.lCustomerId = Customers.lCustomerID INNER JOIN
                         VIPAccountTypes ON CustomerUnlimitedTransactions.lMonthlyAccountTypeId = VIPAccountTypes.lAccountType INNER JOIN
                         Surcharges ON VIPAccountTypes.lSurchargeId = Surcharges.Surcharge_ID INNER JOIN
                         Users ON Customers.lGreeterID = Users.ID_User
WHERE        (Customers.dtCreated BETWEEN CONVERT(DATETIME, @startdate, 102) AND CONVERT(DATETIME, @enddate, 102)) AND 
                         (CustomerUnlimitedTransactions.sTransactionType = N'sale') AND (CustomerUnlimitedTransactions.lMonthlyAccountTypeId = '11') OR
                         (Customers.dtCreated BETWEEN CONVERT(DATETIME, @startdate, 102) AND CONVERT(DATETIME, @enddate, 102)) AND 
                         (CustomerUnlimitedTransactions.sTransactionType = N'sale') AND (CustomerUnlimitedTransactions.lMonthlyAccountTypeId = '12')
ORDER BY Created

如果我像这样运行查询，我仍然不会返回任何结果：

SELECT        Customers.sBarcode AS Barcode, Customers.dtCreated AS Created, CustomerUnlimitedTransactions.sCreatedBy AS [Commission pays], 
                             Surcharges.sDescription AS [Unlimited Package], Surcharges.dblCommission AS [Commission Amount], Users.sUserName AS Greeter, @startdate AS Start_Date, 
                             @enddate AS End_Date
    FROM            CustomerUnlimitedTransactions INNER JOIN
                             Customers ON CustomerUnlimitedTransactions.lCustomerId = Customers.lCustomerID INNER JOIN
                             VIPAccountTypes ON CustomerUnlimitedTransactions.lMonthlyAccountTypeId = VIPAccountTypes.lAccountType INNER JOIN
                             Surcharges ON VIPAccountTypes.lSurchargeId = Surcharges.Surcharge_ID INNER JOIN
                             Users ON Customers.lGreeterID = Users.ID_User
    WHERE        (Customers.dtCreated BETWEEN CONVERT(DATETIME, @startdate, 102) AND CONVERT(DATETIME, @enddate, 102))
    ORDER BY Created

如果我像这样运行查询，我会得到结果：

SELECT        Customers.sBarcode AS Barcode, Customers.dtCreated AS Created, CustomerUnlimitedTransactions.sCreatedBy AS [Commission pays], 
                                 Surcharges.sDescription AS [Unlimited Package], Surcharges.dblCommission AS [Commission Amount], Users.sUserName AS Greeter, @startdate AS Start_Date, 
                                 @enddate AS End_Date
        FROM            CustomerUnlimitedTransactions INNER JOIN
                                 Customers ON CustomerUnlimitedTransactions.lCustomerId = Customers.lCustomerID 
        WHERE        (Customers.dtCreated BETWEEN CONVERT(DATETIME, @startdate, 102) AND CONVERT(DATETIME, @enddate, 102))
        ORDER BY Created

没有任何Null与上述任何查询相关联。再次这适用于12个中的10个......是的，数据库完全相同。（如果我在一年的日期范围内运行此查询，我会得到结果）但是我应该仅显示上周的25个结果，并且我在每个日期都没有显示结果。

Answer 1

如果数据库实际上是相同的（请参阅Tony Hopkinson的评论），那么请查看您正在进行JOIN的字段以查看是否存在任何空值。

Answer 2

提示：IN关键字为WHERE子句

创建奇迹

WHERE Customers.dtCreated BETWEEN CONVERT(DATETIME, @startdate, 102)
                              AND CONVERT(DATETIME, @enddate, 102)
  AND CustomerUnlimitedTransactions.sTransactionType = N'sale'
  AND CustomerUnlimitedTransactions.lMonthlyAccountTypeId in ('11',12)

对于不影响JOIN中其他表的WHERE子句，我非常怀疑你需要将它们从INNER JOIN转换为LEFT JOIN。

正如所写（提示＃2：请使用合理的别名自由）

      FROM CustomerUnlimitedTransactions T
INNER JOIN Customers C ON T.lCustomerId = C.lCustomerID
INNER JOIN VIPAccountTypes V ON T.lMonthlyAccountTypeId = V.lAccountType
INNER JOIN Surcharges S ON V.lSurchargeId = S.Surcharge_ID
INNER JOIN Users U ON C.lGreeterID = U.ID_User

如果要在最终结果中显示一行，则客户必须至少有一个涉及收费的VIP帐户类型的交易，并且必须受到欢迎（松散读取联接）。 JOIN和行上的任何空值都会消失。

多表查询无法在某些数据库上运行

2 个答案: