On Tue, Feb 10, 2015 at 09:47:22PM -0500, Peter Eisentraut wrote: > On 2/9/15 3:12 AM, Jeff Davis wrote: > > On Sat, 2015-02-07 at 16:08 -0800, Jeff Davis wrote: > >> I believe Inclusion Constraints will be important for postgres. > > > > I forgot to credit Darren Duncan with the name of this feature: > > > > http://www.postgresql.org/message-id/4f8bb9b0.5090...@darrenduncan.net > > I think it would be confusing to name something inclusion constraint > that is not somehow the opposite of an exclusion constraint.
To my view, this opposition is there. In both cases, permission for a tuple to exist is based on another other tuple's presence with some generalized equality criterion. In the exclusion case, it's prevented. In the inclusion case, it's required. Cheers, David. -- David Fetter <da...@fetter.org> http://fetter.org/ Phone: +1 415 235 3778 AIM: dfetter666 Yahoo!: dfetter Skype: davidfetter XMPP: david.fet...@gmail.com Remember to vote! Consider donating to Postgres: http://www.postgresql.org/about/donate -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
