declare @str varchar(20)
set @str=''
select @str=@str+','+LTRIM(a01) from A
select RIGHT(@str,LEN(@str)-1) as new

------解决方案--------------------
SQL code
declare @A table (a01 varchar(32))
insert @a select 'aa' union all select  '34' union all select 'b1'

declare @str varchar(20)
set @str=''
select @str=@str+','+LTRIM(a01) from @A
select RIGHT(@str,LEN(@str)-1) as new
/*
new
aa,34,b1
*/