| From: | Andrew Sullivan <ajs(at)crankycanuck(dot)ca> |
|---|---|
| To: | pgsql-sql(at)postgresql(dot)org |
| Subject: | Re: Differentiate Between Zero-Length String and NULLColumn Values |
| Date: | 2007-01-30 14:23:32 |
| Message-ID: | 20070130142332.GA31905@phlogiston.dyndns.org |
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| Lists: | pgsql-sql |
On Tue, Jan 30, 2007 at 02:38:07PM +0100, Bart Degryse wrote:
> Andrew, I think you're wrong stating that Oracle would interpret
> NULL and empty string as equal. The Oracle databases I use (8, 9
> and 10) certainly make a distiction between both values. Maybe
> earlier versions did so, that I don't know.
Hmm. Well, I'm not an Oracle guy, so I don't really know. All I
know is that we occasionally get people coming from Oracle who are
surprised by this difference. What I've been _told_ is that '' and
NULL are under some circumstances (maybe integers?) the same thing,
whereas of course ' ' and NULL are not. But since I'm not an Oracle
user, people should feel free to ignore me :)
A
--
Andrew Sullivan | ajs(at)crankycanuck(dot)ca
Everything that happens in the world happens at some place.
--Jane Jacobs
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