From: | Laszlo Tibor <ltibor(at)mail(dot)tiszanet(dot)hu> |
---|---|
To: | Andre Schubert <andre(dot)schubert(at)km3(dot)de>, pgsql-sql(at)postgresql(dot)org |
Subject: | Re: REFERENCES |
Date: | 2002-03-13 11:03:35 |
Message-ID: | NDELKOGEMPNIBNDBEANMOEDGCBAA.ltibor@mail.tiszanet.hu |
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Lists: | pgsql-sql |
On Wednesday, March 13, 2002 11:53 AM Behalf Of Andre Schubert wrote:
> Hi to all,
>
> i have a simple problem and wont request assistance fro m this list.
> i have to tables
>
> foo:
> id int8 UNIQUE
>
> bar:
> id int8 UNIQUE
> foo_id int8
>
> Now i wont foo_id to be a id which exists in the foo, this could be done
> with foo_id REFERENCES foo (id).
> But what should i do if i want foo_id to be a id existing in foo or to
> be zero(0).
> I have created a view as "select id from foo UNION select 0" and tried
> to REFERENCE against this view, but that
> doesnt work.
> Can this problem be solved by a somebody ????
>
> Thanks
Why do you want to use zeros? A foreign key could be NULL.
Regards, Tibor
ltibor(at)mail(dot)tiszanet(dot)hu
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