On Wed, Jan 07, 2015 at 05:18:58PM -0800, Peter Geoghegan wrote: > On Wed, Jan 7, 2015 at 5:16 PM, David Fetter <da...@fetter.org> wrote: > > There's precedent. Unique constraints, for example. > > I don't see that as any kind of precedent.
In the part you sliced off, Stephen described a situation where the contents of a database either do or don't cause a query to violate a constraint. Uniqueness constraints are one example of this. CREATE TABLE foo(id INTEGER PRIMARY KEY); INSERT INTO foo(id) VALUES(1); /* Works the first time */ INSERT INTO foo(id) VALUES(1); /* Fails the next time */ Same database, same constraints, different outcome. 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
