SQL: Aggregating strings together

问题:

In my SQL Server 2005 database, using an SLQ query, does anyone know 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

Thanks for any help.

回答1:

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.

回答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/