Re: Temporal Databases, offtopic - relative updates

hello,

I have a somehow related question to this topic: is it possible to know
(in postgresql) if an update on a column is absolute (set col = 3) or
relative to it's previous value (set col = col + 3)
in a trigger one have access to OLD row values and NEW row values, but
no correlation between the two. is this type of information available
somewhere in postgresql ?

thanks,
Razvan Radu

Rodrigo Sakai wrote:
>   Hi everyone,
>
>   I'm focus on temporal databases (not temporary), and I want to know
> if anyone here is studying this tecnologies too. So, we can exchange
> knowlegment. Specifically, anyone who is trying to implement on
> postgresql the aspect of time (temporal).
>   These researches are lead by Richard Snodgrass. So, anyone who have
> something to share, please contact me!
>
>   Thanks!!!
>