以下为引用的内容：

CREATE FUNCTION dbo.f_str(@id int)

RETURNS varchar(8000)

AS

BEGIN

    DECLARE @r varchar(8000)

    SET @r = ''

    SELECT @r = @r + ',' + value

    FROM tb

    WHERE id=@id

    RETURN STUFF(@r, 1, 1, '')

END

GO

-- 调用函数

SELECt id, values=dbo.f_str(id)

FROM tb

GROUP BY id

以下为引用的内容：

DECLARE @t TABLE(id int, value varchar(10))

INSERT @t SELECT 1, 'aa'

UNION ALL SELECT 1, 'bb'

UNION ALL SELECT 2, 'aaa'

UNION ALL SELECT 2, 'bbb'

UNION ALL SELECT 2, 'ccc'

以下为引用的内容：

SELECT *

FROM(

    SELECT DISTINCT

        id

    FROM @t

)A

OUTER APPLY(

    SELECT

        [values]= STUFF(REPLACE(REPLACE(

            (

                SELECT value FROM @t N

                WHERE id = A.id

                FOR XML AUTO

            ), '<N value="', ','), '"/>', ''), 1, 1, '')

)N

/*--结果

id          values

----------- ----------------

1           aa,bb

2           aaa,bbb,ccc

(2 行受影响)

--*/