From: Tom Lane <tgl@sss.pgh.pa.us>
To: Gunther Schadow <gunther@aurora.regenstrief.org>
Cc: pgsql-sql@postgresql.org
Subject: Re: Decision support query inefficiencies ...
Date: Mon, 29 Jul 2002 16:39:43 -0400
Message-ID: <11828.1027975183@sss.pgh.pa.us> (raw)
In-Reply-To: <3D459ED0.3030000@aurora.regenstrief.org>
References: <3D459ED0.3030000@aurora.regenstrief.org>
Gunther Schadow <gunther@aurora.regenstrief.org> writes:
> A very frequent decision support query we have to make is to get the
> last act of a certain type that occurred before a certain cut-off
> date.
This seems pretty close to the type of problem DISTINCT ON is intended
to solve. Look at the "weather report" example in the SELECT reference
page.
regards, tom lane
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Cc: tgl@sss.pgh.pa.us, gunther@aurora.regenstrief.org
Subject: Re: Decision support query inefficiencies ...
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