2009/7/28 Tom Lane <t...@sss.pgh.pa.us>: > [sigh, forgot to cc hackers the first time ] > > Foreign key behavior is only sane if the referenced column(s) are > unique. With the proposed patch, it is possible that the uniqueness > check on the referenced columns is deferred, which means it might not > occur till after an FK check does. Discuss. > > regards, tom lane >
Hmm, yes, looking in the SQL spec, I've just noticed this under 11.8, referential constraint definition: "The table constraint descriptor describing the <unique constraint definition> whose <unique column list> identifies the referenced columns shall indicate that the unique constraint is not deferrable." which seems like a sensible policy now that I think about it. - Dean -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
