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From: Rod Taylor <pg@rbt.ca>
To: Jan Wieck <JanWieck@Yahoo.com>
Cc: Markus Bertheau <twanger@bluetwanger.de>
Cc: Josh Berkus <josh@agliodbs.com>
Cc: olly@lfix.co.uk, pgsql-sql@postgresql.org, Bruce Momjian <pgman@candle.pha.pa.us>
Subject: Re: multi column foreign key for implicitly unique columns
Date: Wed, 18 Aug 2004 11:45:03 -0400
Message-ID: <1092843903.32799.132.camel@jester> (raw)
In-Reply-To: <41236277.5060903@Yahoo.com>
References: <1092734724.2627.4.camel@dicaprio.akademie1.de>
	<1092735576.28365.48.camel@linda>
	<1092736197.2627.12.camel@dicaprio.akademie1.de>
	<200408171945.15663.josh@agliodbs.com>
	<41235A90.1080300@Yahoo.com>
	<1092836961.2630.3.camel@dicaprio.akademie1.de>
	<41236277.5060903@Yahoo.com>

> However, Bruce, this should be on the TODO list:
> 
>      * Allow foreign key to reference a superset of the columns
>        covered by a unique constraint on the referenced table.

It would probably be more beneficial to be able to create a unique
constraint without requiring the fields be indexed.

Gets rid of most of the overhead from double uniques.





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