Multiple SQL queries to merge

Neither in sql 2000 nor in sql 2005, there is no aggregation function for strings,
so when we deal with the following requirements, it will be more troublesome:
there is a table tb, as follows:
id value

---

1 aa
1 bb
2 aaa
2 bbb
2 ccc
need to get the result:
id values

---

1 aa,bb
2 aaa,bbb,ccc
ie group by id, find the sum of value (addition of strings)

1. Old solution

– 1. Create a processing function
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
-call function

SELECt id, values=dbo.f_str(id)
FROM tb
GROUP BY id

– 2. New solution
– sample data
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