On 1/11/08, alphax <alphax@vip.163.com> wrote:
> I want to determines a given record which visible to current transaction
> whether or not be updated after some time point, that time point is
> indicated by aother transaction id started and committed in past time.
I'm not sure I understand, but maybe this thread will help?
http://archives.postgresql.org/pgsql-general/2007-10/msg00503.php