Create function [dbo].[AF_TableColumns](@table_name nvarchar(55))

returns nvarchar(4000) as

begin

declare @STR nvarchar(4000)

select @STR = cast(rtrim(ltrim(column_name)) as nvarchar(500)) + coalesce('' + @STR , '')

from information_schema.columns

where table_name = @table_name

group...