I have two tables, town and townalias, the latter containing alternative town names. I would like to ensure that a town name is unique per country-region across the two tables. Can I do this with a constraint ot do I need to implement the logic via trigger? ========= PostgreSQl 8.4 CREATE TABLE town ( country_fk character varying(3) NOT NULL, region_fk character varying(3) NOT NULL, id serial NOT NULL, "name" character varying(50) NOT NULL ) CREATE TABLE townalias ( country_fk character varying(3) NOT NULL, region_fk character varying(3) NOT NULL, town_fk integer NOT NULL, id serial NOT NULL, "name" character varying(50) NOT NULL, CONSTRAINT town_townalias_fk FOREIGN KEY (country_fk, region_fk, town_fk) REFERENCES town (country_fk, region_fk, id) ) -- Best Regards, Tarlika Elisabeth Schmitz -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
