"Wm. G. Urquhart" wrote:
>
> On Thu, 23 May 2002, Mike Mascari wrote:
>
> <snip/>
> > Also, if by chance you are coming over from Oracle and expect an empty
> > string to be treated as NULL, it is not...
> >
> > Mike Mascari
> > mascarm@mascari.com
> >
>
> Well I have a few years of Oracle behind me and it has to said I was
> working on that assumption.
>
> With that said if '' does != NULL then what does? Just NULL? In my book
> NULL means undefined and IMHO you can't get more undefined than ''!
>
> I called my stored function passing NULL as a parameter and sure enough
> the error was raised. So, what I'm going to have to do now is add code to
> either the C++ application or within the script to trap empty $.
>
> Oh well.
You could:
CREATE TABLE foo (
value text CHECK (COALESCE(value, '') <> '')
);
if you want to prohibit both NULL and empty text as data...
Hope that helps,
Mike Mascari
mascarm@mascari.com