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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Richard Huxton <dev@archonet.com>
Cc: 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 12:18:37 -0400
Message-ID: <1535.1092845917@sss.pgh.pa.us> (raw)
In-Reply-To: <41237DA2.9090405@archonet.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>
	<22808.1092842209@sss.pgh.pa.us>
	<41237DA2.9090405@archonet.com>

Richard Huxton <dev@archonet.com> writes:
> * Allow multiple unique constraints to share an index where one is a 
> superset of the others' columns.

> That way you can mark it unique without having the overhead of multiple 
> indexes.

That just moves the uncertain-dependency problem over one spot, ie, it's
the fabricated unique constraint that you can't pin down the
requirements for.

			regards, tom lane



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