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From: Bruno Wolff III <bruno@wolff.to>
To: T E Schmitz <mailreg@numerixtechnology.de>
Cc: Alvaro Herrera <alvherre@dcc.uchile.cl>
Cc: pgsql-sql@postgresql.org
Subject: Re: cost of CREATE VIEW ...  AS SELECT DISTINCT
Date: Tue, 29 Mar 2005 09:07:10 -0600
Message-ID: <20050329150710.GB32031@wolff.to> (raw)
In-Reply-To: <42496248.4080407@numerixtechnology.de>
References: <42487A6D.6020506@numerixtechnology.de>
	<1112047463.22988.25.camel@state.g2switchworks.com>
	<424928D8.7060705@numerixtechnology.de>
	<20050329132941.GA27251@wolff.to>
	<4249564B.1000807@numerixtechnology.de>
	<20050329135823.GA23852@dcc.uchile.cl>
	<42496248.4080407@numerixtechnology.de>

On Tue, Mar 29, 2005 at 15:12:24 +0100,
  T E Schmitz <mailreg@numerixtechnology.de> wrote:
> 
> Shall do.
> But am I correct in assuming that I should place an index on the group 
> by (TRANSAKTION.ORIGIN) column?

This will mainly help when joining the view to another table. This would
also allow using an index scan instead of a sort in for DISTINCT which
may be faster in some cases.



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  Subject: Re: cost of CREATE VIEW ...  AS SELECT DISTINCT
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