Dear Gurus,
----- Original Message -----
From: "Stephan Szabo" <[EMAIL PROTECTED]>
Sent: Thursday, June 10, 2004 7:14 PM
>
> On Thu, 10 Jun 2004, Stephan Szabo wrote:
>
> >
> > On Thu, 10 Jun 2004, Jean-Luc Lachance wrote:
> >
> > > I agree, but it should be a simple rewrite. No?
> >
> > It's NULLs inside the subselect that are the issue.
> >
> > select 1 in (select a from foo)
> > select exists ( select 1 from foo where a=1)
Just a dumb try :)
SELECT (exists(select 1 from foo where a isnull) AND NULL)
OR exists(select 1 from foo where a=1)
AFAIK this returns
* NULL if (NULL in foo.a) and (1 not in foo.a)
* (1 in foo.a) otherwise.
The weakness is the doubled exists clause. I'm sure it makes most cases at
least doubtful...
G.
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