Merge multiple rows into a single row

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

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]

Answer 2

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