Convert comas values into column in sql sqrver

CREATE TABLE #test(id int, data varchar(100))

INSERT INTO #test VALUES (1,'This,is,a,test,string')
INSERT INTO #test VALUES (2,'See,if,it,can,be,split,into,many,columns')

SELECT * FROM #test

DECLARE @pivot varchar(8000)
DECLARE @select varchar(8000)

SELECT
        @pivot=coalesce(@pivot+',','')+'[col'+cast(number+1 as varchar(10))+']'
FROM
        master..spt_values where type='p' and
        number<=(SELECT max(len(data)-len(replace(data,',',''))) FROM #test)

SELECT
    @select='
        select p.*
        from (
        select
            id,substring(data, start+2, endPos-Start-2) as token,
            ''col''+cast(row_number() over(partition by id order by start) as varchar(10)) as n
        from (
            select
                id, data, n as start, charindex('','',data,n+2) endPos
                from (select number as n from master..spt_values where type=''p'') num
                cross join
                (
                    select
                        id, '','' + data +'','' as data
                    from
                        #test
                ) m
            where n < len(data)-1
            and substring(data,n+1,1) = '','') as data
        ) pvt
        Pivot ( max(token)for n in ('+@pivot+'))p'

EXEC(@select)

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