W dniu 01.03.2016 o 20:02, Igor Neyman pisze: [--------------------] > > > It just occured to me: how do I make sure (e.g. force within a database) with the above structure, that a message can have *only one* sender? > but, allow for multiple recepients? > > -R > > ____________________________________________________________________________________ > > If I'm not too late, unique partial index: > > CREATE UNIQUE INDEX unique_message_sender (message_id, person_id) WHERE relationship_type = sender; > Of cource. Apparently I'm so twisted after the numerous rewrites of my schema for this project, that I forget the obvious. Thenx, -R -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
