>> I know I can setup a FK constraint to make sure Table1.ColA exists in >> Table2.Key, however what if I want to do the reverse? >> >> I want to ensure Table1.ColA does NOT exist in Table2.Key.. Can I do >> this with any sort of CHECK constraint, trigger, custom function, etc? > > > The most common constraints are provided for, but then after that you > have to use triggers. > > PostgreSQL deliberately doesn't support queries in CHECK constraints > for this reason. Thanks! I wrote a Trigger for this and it seems to work fairly well.. I kinda figured that was the obvious way, but thought there might be some new 9.x feature that made this sort of thing possible. -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
