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How to collapse rows returned from SQL SELECT into one?

Posted on 2004-04-06
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Last Modified: 2008-02-20
Hello,

the following query joins two tables and produces the following results:

SELECT DT1.Name, DT1.SectorID, DT1.ExposureBiasID, DT2.AssetClassID
FROM DT_Strategy DT1, DT_StrategyAssetClass DT2
WHERE DT1.ID = DT2.StrategyID AND DT1.ID = 1

------------------------------------------------------------------
Relative Value Equity Long      4      1      1
Relative Value Equity Long      4      1      2
Relative Value Equity Long      4      1      3
------------------------------------------------------------------

All the resulting rows are equal except for the value in the last column. I would like to collapse them into one row as follows:

----------------------------------------------------------------------
Relative Value Equity Long      4      1      1,2,3
----------------------------------------------------------------------

Is this possible in SQL? Or do I need to do it programatically?

Thanks,
Stefano
0
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Question by:sdamiano
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2 Comments
 
LVL 70

Accepted Solution

by:
Scott Pletcher earned 1000 total points
ID: 10770277
On SQL 2000, you can use a user-defined function.  For example:


CREATE FUNCTION dbo.getAssetClassIDs (
      @ID INT
)
RETURNS VARCHAR(1000)
AS
BEGIN
DECLARE @AssetClassIDs VARCHAR(1000)
SET @AssetClassIDs = ''
SELECT @AssetClassIDs = @AssetClassIDs + CAST(AssetClassID AS VARCHAR(10)) + ','
FROM DT_StrategyAssetClass
WHERE StrategyID = @ID
RETURN LEFT(@AssetClassIDs, LEN(@AssetClassIDs) - 1)
END --FUNCTION
GO


Then, to use the function:

SELECT DT1.Name, DT1.SectorID, DT1.ExposureBiasID, dbo.getAssetClassIDs(DT1.ID)
FROM DT_Strategy DT1
WHERE DT1.ID = 1
0
 

Author Comment

by:sdamiano
ID: 10770600
Scott,

it works perfectly!

Thanks,
Stefano
0

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