From: Josh Berkus <josh@agliodbs.com>
To: Jan Wieck <JanWieck@Yahoo.com>
Cc: pgsql-sql@postgresql.org
Subject: Re: multi column foreign key for implicitly unique columns
Date: Thu, 19 Aug 2004 09:21:59 -0700
Message-ID: <200408190921.59529.josh@agliodbs.com> (raw)
In-Reply-To: <4123D91D.8060601@Yahoo.com>
References: <1092734724.2627.4.camel@dicaprio.akademie1.de>
<200408181155.34472.josh@agliodbs.com>
<4123D91D.8060601@Yahoo.com>
Jan,
> Because the value in b.y is redundant. b.x->a.x->a.y is exactly the same
> value and he even wants to ensure this with the constraint.
And in the absence of that constraint, what ensures that b.y = a.y, exactly?
--
Josh Berkus
Aglio Database Solutions
San Francisco
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To: pgsql-sql@postgresql.org
Cc: josh@agliodbs.com, JanWieck@Yahoo.com
Subject: Re: multi column foreign key for implicitly unique columns
In-Reply-To: <200408190921.59529.josh@agliodbs.com>
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