Re: RE:REFERENCES

From: Stephan Szabo <sszabo(at)megazone23(dot)bigpanda(dot)com>
To: ngterry <ngterry(at)sinaman(dot)com>
Cc: Darren Ferguson <darren(at)crystalballinc(dot)com>, <pgsql-general(at)postgresql(dot)org>
Subject: Re: RE:REFERENCES
Date: 2002-03-11 02:03:18
Message-ID: 20020310180204.P37006-100000@megazone23.bigpanda.com
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On Mon, 11 Mar 2002, [big5] ngterry wrote:

>
> I am sorry what I am trying is:
>
> >CREATE TABLE purchase (id int, po int, date date, PRIMARY KEY (id));
> >
> >CREATE TABLE lcopen (lc numeric, po int, PRIMARY KEY (lc));
>
> replace with:
> CREATE TABLE lcopen (lc numeric, po int REFERENCES purchase (po), PRIMARY KEY (lc));
> but there is an error and I do not how to correct that.

The target of a references constraint must be defined to be unique via
either a unique constraint or primary key constraint. Do you really want
two separate ids on purchase?

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