Re: [SQL] Foreign Key ??

On Sun, 8 Nov 1998, David Jackson wrote:

> CONSTRAINT NAME_FK FOREIGN KEY (client_name)
> REFERENCES client(client_name)
> );
> This results in FUNCTION NOT IMPLETEMENTED error.
>
Yes, that's true. There is no built-in referential integrity in
PostgresSQL. Anyway there are two "external" functions in the contrib/spi
directory which implement the referential integrity.
You can use these functions via triggers.

All the docs and the sources are in the contrib/spi dir in the source code
distribution (v6.4), I don't remember if they are also available in the
v6.3 source code distibution.

Bye.

------------------------------------------------------------------------------
Greetings from Fabio Mancinelli E-Mail : mancinel(at)univaq(dot)it
Computer Science Student xenon(at)olografix(dot)org
University of L'Aquila WWW : http://univaq.it/~mancinel
(PGP Public Key available) http://www.olografix.org/xenon