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SQL: Aggregating strings together

Asked 2011-03-27T21:46:10.233
17

What is the best way to group records together by one field, and get a comma-separated list of the values from another? So if I have:

UserID        Code
  1            A
  1            C5
  1            X
  2            V3
  3            B
  3            D
  3            NULL
  3            F4
  4            NULL

I'd get:

 UserID        Code
  1            A,C5,X
  2            V3
  3            B,D,F4
  4            NULL

I'm using SQL Server 2005 database. Thanks for any help.

sql sql-server-2005
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2 Answers

21
WITH Data AS (
    SELECT 1 UserId, 'A' Code 
    UNION ALL 
    SELECT 1, 'C5'
    UNION ALL 
    SELECT 1, 'X'
    UNION ALL 
    SELECT 2, 'V3'
    UNION ALL 
    SELECT 3, 'B'
    UNION ALL 
    SELECT 3, 'D'
    UNION ALL 
    SELECT 3, NULL
    UNION ALL 
    SELECT 3, 'F4'
    UNION ALL 
    SELECT 4, NULL
)
SELECT U.UserId, STUFF((
    SELECT ','+Code FROM Data WHERE Data.UserID = U.UserID FOR XML PATH('')
), 1, 1, '') Code 
FROM (SELECT DISTINCT UserID FROM Data) U

Just replace the Data CTE with your table name and you're done.

answered 2011-03-27T21:59:34.587
2

There it´s a complete review of forms to do that in TSQL

http://www.simple-talk.com/sql/t-sql-programming/concatenating-row-values-in-transact-sql/

answered 2011-03-27T22:07:52.587

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