Staus of Primary/Foreign key?

    I have implemented referential integrity in older Postgres projects
    using functions. I am preparing to do a new project, aand was wondering
    what the status of Primary/Foreign key implementation was?

    I am starting with 6.4.2,

    Thanks.

--
Stan Brown     stanb@netcom.com                                    843-745-3154
Westvaco
Charleston SC.
--
Windows 98: n.
    useless extension to a minor patch release for 32-bit extensions and
    a graphical shell for a 16-bit patch to an 8-bit operating system
    originally coded for a 4-bit microprocessor, written by a 2-bit
    company that can't stand for 1 bit of competition.
-
(c) 1999 Stan Brown.  Redistribution via the Microsoft Network is prohibited.