On Wed, Mar 08, 2006 at 12:56:38 -0300, Rodrigo Sakai <rodrigo.sakai@xxxxxxxxxxx> wrote: > Ok, but actually I'm not concerned about logging old values. I'm concerned > about checking temporal constraints. Entity Integrity (PK) and Referential > Integrity (FK). Did you see the reference to 'Developing Time-Oriented Database Applications in SQL' (http://www.cs.arizona.edu/people/rts/tdbbook.pdf) in a recent thread? That should give you some trigger code you can use to do this kind of thing. It isn't postgres specific, but shouldn't need too much work.