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我正在尝试加入一个内部查询，该查询的结果由另一个表中的值过滤，因此我可以选择顶部结果并在我的主选择语句中多次使用其中的值，但我得到了错误如下：

无法绑定多部分标识符“TessSCCall.Call_Num”。

到目前为止，请参见下面的代码：

SELECT BestAppointmentOffer AS foo -- I'm using this lots of times in different fields
        BestAppointmentOffer AS bar -- I'm using this lots of times in different fields
    ....
FROM TessSCEmploy 
INNER JOIN TessSCCall on TessSCEmploy.Employ_Num = TessSCCall.Call_Employ_Num
INNER JOIN
(
   SELECT TOP 1 dbo.Aqua_Midnight(AppointmentStartTime) 
     AS BestAppointmentOffer,    CallNumber
   FROM AQWEB.[360Tracking].dbo.AppointmentOffers
   WHERE CallNumber = TessSCCall.Call_Num
   ORDER BY AppointmentStartTime) AS Appointment 
 on TessSCCall.Call_Num = Appointment.CallNumber
where ....

我怎样才能让它工作，所以我可以在多个字段的计算中使用我的查询（我目前正在尝试加入）中的值，而不重复它？

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2 回答 2

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最简单的方法是使用CROSS APPLY，但由于您使用的是 SQL Server 2000，因此您没有该选项。您应该能够使用聚合函数来获得每个约会时间的最佳结果：

select BestAppointmentOffer AS foo -- I'm using this lots of times in different fields
        BestAppointmentOffer AS bar -- I'm using this lots of times in different fields
    ....
from TessSCEmploy 
inner join TessSCCall 
  on TessSCEmploy.Employ_Num = TessSCCall.Call_Employ_Num
INNER JOIN 
(
  SELECT min(dbo.Aqua_Midnight(AppointmentStartTime)) AS BestAppointmentOffer, 
    CallNumber
  FROM AQWEB.[360Tracking].dbo.AppointmentOffers
  GROUP BY CallNumber
) AS Appointment 
  on TessSCCall.Call_Num = Appointment.CallNumber
where ....
于 2013-05-16T11:05:29.893 回答
0

您需要 CROSS APPLY 关联派生表中的列

...

TessSCEmploy inner join TessSCCall on TessSCEmploy.Employ_Num = TessSCCall.Call_Employ_Num

CROSS APPLY
(SELECT TOP 1 dbo.Aqua_Midnight(AppointmentStartTime) AS BestAppointmentOffer, CallNumber
 FROM AQWEB.[360Tracking].dbo.AppointmentOffers
 WHERE CallNumber = TessSCCall.Call_Num
 ORDER BY AppointmentStartTime) AS Appointment on TessSCCall.Call_Num = Appointment.CallNumber

where ....

无论如何，CROSS APPLY 都是正确的构造，它是“每件事的 TOP 1”

于 2013-05-16T11:04:26.677 回答