create procedure test
@fld varchar(100)
as
declare @sql nvarchar(500)
set @sql='declare xyz cursor fast_forward for select ' + @fld + ' from abc'
exec sp_executesql @sql
open xyz
fetch next from xyz into ....(@fld是所要查询的列的字符串，是未知个数的，这里应该怎么写呢？)...
............
......