sql - subquery - 外側のクエリ値を参照する方法

Question

以下のクエリは正常に機能しています。

SELECT 
   tblCase.ID AS CaseID, tblCase.UserID AS MyCasesFilter, 
   tblGroupMembership.UserID AS GroupShareFilter, 
   tblDirectCaseSharing.ReceiverUserID AS DirectShareFilter, tblCase.EntryDate, 
   tblUser.LastName AS CaseAuthor, tblCase.Name AS CaseName, 
   COUNT(DISTINCT tblCaseImage.ID) AS TotalImages, 
   tblCaseType.Name AS CaseType, tblCase.SiteName, tblCase.Category, 
   tblCase.FollowUpDateTime, tblCase.Notes
FROM     
   tblDirectCaseSharing 
RIGHT OUTER JOIN
   tblCase 
INNER JOIN tblUser ON tblCase.UserID = tblUser.ID ON tblDirectCaseSharing.CaseID = tblCase.ID 
LEFT OUTER JOIN
   tblGroupMembership 
INNER JOIN
   tblGroupCase ON tblGroupMembership.GroupID = tblGroupCase.GroupID ON tblCase.ID = tblGroupCase.CaseID 
LEFT OUTER JOIN
   tblCaseType ON tblCase.CaseTypeID = tblCaseType.ID 
LEFT OUTER JOIN
   tblCaseImage ON tblCase.ID = tblCaseImage.CaseID
GROUP BY 
   tblCase.ID, tblCaseType.Name, tblCase.SiteName, tblCase.EntryDate, 
   tblCase.Category, tblCase.FollowUpDateTime, tblCase.Notes, tblCase.UserID, 
   tblGroupMembership.UserID, tblDirectCaseSharing.ReceiverUserID, 
   tblUser.LastName, tblCase.Name
HAVING 
   (tblCase.UserID = 1) 
   AND (tblGroupMembership.UserID = 2) 
   AND (tblDirectCaseSharing.ReceiverUserID = 3)
ORDER BY 
   tblCase.EntryDate DESC

次の選択サブクエリを使用して、上記の結果に追加の選択列を追加したいと思います。

STUFF((
SELECT ', ' +tblGroup.Name  as [text()] 
FROM     tblCase INNER JOIN
                  tblGroupCase ON tblCase.ID = tblGroupCase.CaseID INNER JOIN
                  tblGroup ON tblGroupCase.GroupID = tblGroup.ID
WHERE tblCase.ID = ***
FOR XML PATH('')
),1,2,'')
AS ConcatGroupShares

select サブクエリには where 句があり、結果セットの最初の列である tblcase.id を取得する必要があります。サブクエリでその値を参照する方法。