Based on your first question a customer id itself is not a valid designator; you have to specify (or link) in the group as well. Not tested but should work: FOREIGN KEY (template, group) REFERENCES customer (cust_id, group) Depends on whether you want to allow cross-group associations if you need a separate group template id. David J. -- View this message in context: http://postgresql.1045698.n5.nabble.com/check-constraint-question-tp5799252p5799282.html Sent from the PostgreSQL - general mailing list archive at Nabble.com. -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
