Question

   Select FileUpload.FileName AS FINAME, FileUpload.FilePath,MemberPersonalInformation.FirstName As SharedBy  from FileUpload 
   INNER JOIN 
   ContentManagement ON ContentManagement.FileId=FileUpload.FileId  
   INNER JOIN 
   MemberPersonalInformation ON MemberPersonalInformation.MemberId=ContentManagement.CreatedBy 
   INNER JOIN
    SubjectMaster ON ContentToIndividual.SubjectId=SubjectMaster.SubjectId 
    where 
   FileUpload.FileId in
    (Select FileId from ContentManagement where ContentId in
    (Select ContentId from ContentToIndividual where ShowToMemberId=12) 
    AND ContentManagement.ContentTypeId=1 and ContentManagement.SessionId=4)

当我执行此查询时，在上一次JOIN中收到错误 The multi-part identifier "ContentToIndividual.SubjectId" could not be bound. 但我在两个表中都有SubjectId。我无法理解这是什么问题。请帮帮我进行。

Answer 1

您正在将SubjectMaster表加入到之前未引用的ContentToIndividual表中。

您需要加入contentToIndvidual才能在SubjectMaster加入中引用它。

e.g。

 Select FileUpload.FileName AS FINAME, 
        FileUpload.FilePath,MemberPersonalInformation.FirstName As SharedBy  
from FileUpload 
   INNER JOIN 
   ContentManagement ON ContentManagement.FileId=FileUpload.FileId  
   INNER JOIN 
   MemberPersonalInformation ON MemberPersonalInformation.MemberId=ContentManagement.CreatedBy 
    -- You need to add it in here   
    Inner Join ContentToIndividual on SomeColumn = AnotherColumn
   INNER JOIN
    SubjectMaster ON ContentToIndividual.SubjectId=SubjectMaster.SubjectId 
    where 
   FileUpload.FileId in
    (Select FileId from ContentManagement where ContentId in
    (Select ContentId from ContentToIndividual where ShowToMemberId=12) 
    AND ContentManagement.ContentTypeId=1 and ContentManagement.SessionId=4)

注意：即使您在子查询中查询ContentToIndividual，如果它不是主要选择查询的一部分，也无法引用该列。

Answer 2

您尚未在主要选择语句中加入ContentToIndividual。您需要添加它或不参考它。

编辑：只是要添加，您实际上不需要在主选择中添加SubjectMaster或ContentToIndividual联接，因为您没有从任何一个表中选择任何列 - 请记住子查询与主查询分开;你只是用它来获取FileIds列表。也可以优化声明的其余部分。

   Select FileUpload.FileName AS FINAME, FileUpload.FilePath,MemberPersonalInformation.FirstName As SharedBy  from FileUpload 
   INNER JOIN 
   ContentManagement ON ContentManagement.FileId=FileUpload.FileId  
   INNER JOIN 
   MemberPersonalInformation ON MemberPersonalInformation.MemberId=ContentManagement.CreatedBy 
   where 
   FileUpload.FileId in
    (Select FileId from ContentManagement where ContentId in
    (Select ContentId from ContentToIndividual where ShowToMemberId=12) 
    AND ContentManagement.ContentTypeId=1 and ContentManagement.SessionId=4)

编辑2：为了好玩，我认为这可以简化一些事情，因为它摆脱了子查询，所以它应该更快......

SELECT      FileUpload.FileName AS FINAME, FileUpload.FilePath,MemberPersonalInformation.FirstName As SharedBy
FROM        FileUpload 
INNER JOIN  ContentManagement ON ContentManagement.FileId=FileUpload.FileId
            AND ContentManagement.ContentTypeId=1
            AND ContentManagement.SessionId=4
INNER JOIN  ContentToIndividual ON ContentToIndividual.ContentId = ContentManagement.ContentId -- Iguessed at this join
            AND ContentToIndividual.ShowToMemberId=12
INNER JOIN  MemberPersonalInformation ON MemberPersonalInformation.MemberId = ContentManagement.CreatedBy

Sql-server 2005中的内连接问题

2 个答案: