| From: | Curt Sampson <cjs(at)cynic(dot)net> |
|---|---|
| To: | Robert Treat <xzilla(at)users(dot)sourceforge(dot)net> |
| Cc: | pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Check Constraints and pg_dump |
| Date: | 2004-03-02 23:25:07 |
| Message-ID: | Pine.NEB.4.58.0403030823490.5580@angelic-vtfw.cvpn.cynic.net |
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| Lists: | pgsql-hackers |
On Tue, 2 Mar 2004, Robert Treat wrote:
> Wouldn't a FK on both tables be the appropriate schema? With the FK on
> contract being deffered?
Unfortunately, it appears that an FK must reference a unique column. So this:
ALTER TABLE contract ADD CONSTRAINT contract_must_have_a_plan
FOREIGN KEY ( contract_id ) REFERENCES plan ( contract_id )
INITIALLY DEFERRED;
produces the error message:
UNIQUE constraint matching given keys for referenced table "plan" not found
Since a plan may have more than one contract.
cjs
--
Curt Sampson <cjs(at)cynic(dot)net> +81 90 7737 2974 http://www.NetBSD.org
Don't you know, in this new Dark Age, we're all light. --XTC
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