The query below is working fine:
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
I want to add an additional select column to the above result using a select subquery which is:
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
The select subquery has a where clause and I need to get the tblcase.id which is the first column of the result set. how to i reference that value in the subquery.
In a SQL database query, a correlated subquery (also known as a synchronized subquery) is a subquery (a query nested inside another query) that uses values from the outer query.
A correlated subquery is a subquery that contains a reference to a table that also appears in the outer query.
A subquery cannot contain an ORDER BY clause. A subquery in an UPDATE statement cannot retrieve data from the same table in which data is to be updated. A subquery in a DELETE statement cannot retrieve data from the same table in which data is to be deleted.
A Subquery or Inner query or a Nested query is a query within another SQL query and embedded within the WHERE clause. A subquery is used to return data that will be used in the main query as a condition to further restrict the data to be retrieved.
Put an alias name in the main query
SELECT
tcase.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 As tcase <=====
And use this alias name in the subquery:
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 = tcase.id
FOR XML PATH('')
),1,2,'')
AS ConcatGroupShares
More about co-related sub-queries:
http://en.wikipedia.org/wiki/Correlated_subquery
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