| From: | Stephan Szabo <sszabo(at)megazone23(dot)bigpanda(dot)com> |
|---|---|
| To: | patrick(dot)jacquot(at)anpe(dot)fr |
| Cc: | liste SQL <pgsql-sql(at)postgresql(dot)org> |
| Subject: | Re: referencing oid impozsible ? |
| Date: | 2001-09-11 16:58:27 |
| Message-ID: | Pine.BSF.4.21.0109110954240.21829-100000@megazone23.bigpanda.com |
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| Lists: | pgsql-sql |
On Tue, 11 Sep 2001 patrick(dot)jacquot(at)anpe(dot)fr wrote:
> hello all
> I tried recently (pgsql 7.1.2) to establish the oid of one table as foreign key
> in another.
> To no avail : there was no uniqueness constraint on that column
> Naturally, it seems impossible to add a uniqueness constraint to such a system
> column.
> As far as i know, the oid is by nature unique, excepting for the case of
> wrapping of their sequence.
> Is there any workaround ?
You could add a unique index on oid (which would basically be the unique
constraint), but IIRC it still won't work on the system attribute.
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