Tom Lane <tgl@sss.pgh.pa.us> writes:
> Florian Weimer <Florian.Weimer@RUS.Uni-Stuttgart.DE> writes:
> > Is there some efficient PostgreSQL expression which is true if and
> > only if two subnets (given as values of type cidr) have non-empty
> > intersection (even if the intersection is not a CIDR network)?
>
> Maybe I'm missing something, but ISTM it's only possible for two
> CIDR subnets to overlap if one contains the other. So you could
> check with
>
> A <<= B OR B <<= A
Oh, I think you are right; I haven't paid attention. Thanks.
--
Florian Weimer Florian.Weimer@RUS.Uni-Stuttgart.DE
University of Stuttgart http://cert.uni-stuttgart.de/
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