Re: constraint/restrict

add an foriegn key on address(country_id), let country(id) be a primary
key.

Jie LIANG

St. Bernard Software
Internet Products Inc.

10350 Science Center Drive
Suite 100, San Diego, CA 92121
Office:(858)320-4873

jliang@ipinc.com
www.stbernard.com
www.ipinc.com

On Wed, 14 Feb 2001, Olaf Marc Zanger wrote:

> hi there,
> 
> with two tables i want to make some constraint-restrictions
> 
> create table address ( id serial,  country_id int4, ....);
> and
> create table country (id serial, ...);
> 
> to make sure that now country-row is deleted if there is still a country_id 
> in address table.
> 
> e.g.
> 
> address: 1, 2, ...
> country: 2, ...
> 
> now country wouldn't be allowed to be deleted. 
> 
> how to do that?
> 
> thanks fo help
> 
> olaf
> -- 
> soli-con Engineering Zanger, Dipl.-Ing. (FH) Olaf Marc Zanger
> Lorrainestrasse 23, 3013 Bern / Switzerland
> fon:+41-31-332 9782, mob:+41-76-572 9782
> mailto:olaf.zanger@soli-con.com, http://www.soli-con.com
>