Re: Select Distinct with LOB fields

In article <46e01453$0$233$e4fe514c_at_news.xs4all.nl>, Shakespeare says...
> > select foo.pk, foo.data
> > from foo
> > where exists ( select null from bar where foo.pk = bar.fk );
> >
>
> I would not use select null here... It works, but I have seen some
> discussions about null before in this group ;-)
>
>

Can you elaborate on that? Surely it doesn't matter what is selected - it's a case of if the subquery returns 0 rows or not?

-- 
jeremy