Re: Foreign Exclusion Constraints - Mailing list pgsql-general

On Wed, Feb 20, 2013 at 2:34 PM, Nathan Boley <npboley@gmail.com> wrote:
> I'm trying to store exons that must fit within a chromosome, but the
> chromosomes all have different lengths, so I want a check constraint
> so that location is contained within CHR_RANGE where CHR_RANGE is
> taken from the chromosomes table.
>
> Can I add that constraint without a trigger?

No, you can't.

There is nothing wrong in doing it with triggers BTW.

>
> The archives seem to say no, but I thought I'd ask...
>
> http://www.postgresql.org/message-id/1288033876.6278.6.camel@vanquo.pezone.net
> http://www.postgresql.org/message-id/CACECd8i4P4iNqUii4Lqsw0qSthawhh3gE=AtmBDSJN25qrx15g@mail.gmail.com
> http://www.postgresql.org/message-id/1678334.8llTyI05Te@hek506
>
> Thanks,
> Nathan Boley
>
>
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