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Horizontal SQL Query

Posted on 2012-03-28
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Last Modified: 2012-08-13
I have a table with the following rows and I need to produce a view that returns 1 row per customer with the 'TaxDetail' values comma-separated.

Example Values:

CustomerID, | TaxDetailID (this is the column header)
1 | 01
1 | 02
1 | 03
2 | 01
2 | 02

I need a query that would return the 2 rows below,

1 | 01, 02, 03
2 | 01, 02

Any advice is appreciated.

Dean
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Question by:dthansen
3 Comments
 
LVL 18

Assisted Solution

by:lludden
lludden earned 100 total points
ID: 37777234
DECLARE @T TABLE (CustomerID int, TaxDetailID varchar(10))

INSERT INTO @T SELECT 1,'01' UNION SELECT 1,'02' UNION SELECT 1,'03' UNION SELECT 2,'01' UNION SELECT 2,'02'

SELECT DISTINCT T.CustomerID,
IDList = Stuff((SELECT DISTINCT  ', ' + T1.TaxDetailID

                            FROM @t T1

                            WHERE t.CustomerID = T1.CustomerID

                            FOR XML PATH ('')),1,1,'') 	
FROM @T T

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0
 

Accepted Solution

by:
lmduffy earned 200 total points
ID: 37777242
I use a UDF() for that type of thing. Basically you write an SQL function that takes the CustomerID as parameter. The function would then look up the TaxDetailIDs for that customer and return them all in a string formatted however you like. In this way, you can do something like this in your main code:

SELECT Distinct CustomerID,
       GetTaxDetails( CustomerID ) as TaxIDs
FROM MyTable

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0
 
LVL 7

Assisted Solution

by:micropc1
micropc1 earned 200 total points
ID: 37777409
I 'm with Imduffy...UDF's the way to go here...

CREATE FUNCTION getTaxDetails (@customerID int)
RETURNS varchar(max)
BEGIN
   DECLARE @list varchar(10)
   SELECT @list = ISNULL(@list, '') + TaxDetailID + ', '
   FROM MyTable
   WHERE CustomerID = @customerID
   RETURN @list
END

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then do as mentioned above...

SELECT customerID, dbo.getTaxDetails(customerID)  AS TaxIDs
FROM MyTable

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