On Sat, Jun 04, 2005 at 11:31:02 +0200,
Joachim Zobel <jzobel(at)heute-morgen(dot)de> wrote:
>
> These are both things I want to avoid. I am not trying to solve a real
> world problem, I want to understand the limits of SQL. And it seems that
> a plain SELECT that tells me if a path exists is not possible. However I
> just read nested sets (thx for the link, Sean). Maybe a tricky
> representation does it.
When 'WITH' gets implemented then you should be able to do this. I think
there was some recent talk about that, but I don't know if it is going to
make it in to 8.1. We'll know in about a month though.