From: Stephan Szabo <sszabo@megazone23.bigpanda.com>
To: jack <datactrl@tpg.com.au>
Cc: pgsql-sql@postgresql.org
Subject: Re: quastions about primary key
Date: Fri, 24 Jan 2003 07:14:11 -0800 (PST)
Message-ID: <20030124071239.T30220-100000@megazone23.bigpanda.com> (raw)
In-Reply-To: <00c301c2c374$1e698650$1400a8c0@jac>
On Fri, 24 Jan 2003, jack wrote:
> Is that possible to have a two columns primary key on a table with null
> value on second column?
No, because primary key implies not null on all columns involved
(technically I think it's that a non-deferrable primary key implies
not null on all columns involved, but we don't support deferrable ones)
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To: pgsql-sql@postgresql.org
Cc: sszabo@megazone23.bigpanda.com, datactrl@tpg.com.au
Subject: Re: quastions about primary key
In-Reply-To: <20030124071239.T30220-100000@megazone23.bigpanda.com>
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