On Mon, Sep 07, 2009 at 07:53:01PM +0900, Itagaki Takahiro wrote:
> However, to be honest, I think standard-compliant column trigger is
> useless... I'm thinking additional extension for triggers -- if we
> want to check modifications of actual values, it could be defined
> as:
>
> CREATE TRIGGER trig BEFORE UPDATE ON tbl FOR EACH ROW
> WHEN (NEW.col <> OLD.col) EXECUTE PROCEDURE trigger_func();
That should probably read:
CREATE TRIGGER trig BEFORE UPDATE ON tbl FOR EACH ROW
WHEN (NEW.col IS DISTINCT FROM OLD.col) EXECUTE PROCEDURE trigger_func();
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
