> On Tue, 28 Jan 2003, Rodger Donaldson wrote: > > > Now, adding a UNIQUE constraint on the pk for add_queue weeds out > > dupes there. However, attempting to add a cross-table UNIQUE check > > with: > > > > alter table add_queue add constraint add_queue_no_dupe_sites unique > > (sites.url); > > ERROR: parser: parse error at or near "." > > > > ,,,fails. Foreign key constraints will only require a match (of one > > sort or another) in the foreign table, according to the postgresql 7.2 > > documentation, and do not have an option to require no match. > > > > Am I missing something obvious (syntax for UNIQUE, for example), or > > trying to do something that just doesn't work that way? > > I'm not sure what a unique constraint on sites.url on table add_queue > is supposed to mean precisely.
Sorry; to clarify, it's table.column notation. > You can probably come pretty close by making a set of triggers on > both tables however. That's what I feared 8). -- Rodger Donaldson [EMAIL PROTECTED] ---------------------------(end of broadcast)--------------------------- TIP 6: Have you searched our list archives? http://archives.postgresql.org
