Merge multiple rows into a single row - sql-server

Question

I would like to know the best approach to merge data from the following rows into a single row in another view.
These are the results as they are currently displayed;
Type_ID | Client_ID | PBX_Vendor |
127 | 090820006311404926326C | Aastra |
127 | 090820006311404926326C | Ericsson |
127 | 111012237401404926326C | Aastra |
127 | 120209287521404926326C | Aastra |
127 | 120209287521404926326C | Alcatel |
The following is how I would like to see the data;
Type_ID | Client_ID | PBX_Vendor |
127 | 090820006311404926326C | Aastra, Ericsson |
127 | 111012237401404926326C | Aastra |
127 | 120209287521404926326C | Aastra, Alcatel |
Basically, there are multiple PBX Vendors associated with a Client ID. I need this display in a single row for a helpdesk system.
I have attempted this already with CONCAT, but all I end up with is a single row with over 100 vendors in it that are not specific to a Client_ID.
Any help with be very much appreciated!

Answer 1

Here's A way to do it (also works with 2005):
Table
DECLARE #table TABLE
(
[Type_ID] INT,
[Client_ID] VARCHAR(50),
[PBX_Vendor] VARCHAR(50)
)
Data
INSERT INTO #table
SELECT 127,
'090820006311404926326C',
'Aastra'
UNION ALL
SELECT 127,
'090820006311404926326C',
'Ericsson'
UNION ALL
SELECT 127,
'111012237401404926326C',
'Aastra'
UNION ALL
SELECT 127,
'120209287521404926326C',
'Aastra'
UNION ALL
SELECT 127,
'120209287521404926326C',
'Alcatel'
Query
SELECT [Type_ID],
[Client_ID],
(
SELECT STUFF((
SELECT ',' + [PBX_Vendor]
FROM #table
WHERE [Client_ID] = tbl.[Client_ID]
AND [Type_ID] = tbl.[Type_ID]
GROUP BY [PBX_Vendor]
ORDER BY [PBX_Vendor]
FOR
XML PATH('')
), 1, 1, '')
) PBX_Vendor
FROM #table tbl
GROUP BY [Type_ID],
[Client_ID]
Result
Type_ID Client_ID PBX_Vendor
127 090820006311404926326C Aastra,Ericsson
127 111012237401404926326C Aastra
127 120209287521404926326C Aastra,Alcatel

Answer 2

Dan, I have managed to get this working using your original Ideas with some modifications. Although I cannot save it as a view as I understand that you cannot save DECLARES as VIEWS;
DECLARE #table TABLE
(
[Type_ID] INT,
[Client_ID] VARCHAR(50),
[PBX_Vendor] VARCHAR(50)
)
INSERT INTO #table
SELECT dbo.AMGR_User_Fields_Tbl.Type_Id, dbo.AMGR_User_Fields_Tbl.Client_Id, dbo.AMGR_User_Field_Defs_Tbl.Description AS PBX_Vendor
FROM dbo.AMGR_User_Fields_Tbl INNER JOIN
dbo.AMGR_User_Field_Defs_Tbl ON dbo.AMGR_User_Fields_Tbl.Type_Id = dbo.AMGR_User_Field_Defs_Tbl.Type_Id AND
dbo.AMGR_User_Fields_Tbl.Code_Id = dbo.AMGR_User_Field_Defs_Tbl.Code_Id
WHERE (dbo.AMGR_User_Fields_Tbl.Type_Id = 127)
SELECT [Type_ID],
[Client_ID],
(
SELECT STUFF((
SELECT ', ' + [PBX_Vendor]
FROM #table
WHERE [Client_ID] = tbl.[Client_ID]
AND [Type_ID] = tbl.[Type_ID]
GROUP BY [PBX_Vendor]
ORDER BY [PBX_Vendor]
FOR
XML PATH('')
), 1, 1, '')
) PBX_Vendor
FROM #table tbl
GROUP BY [Type_ID],
[Client_ID]