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Date: Sun, 15 Feb 2004 13:51:52 -0600
From: Bruno Wolff III <bruno@wolff.to>
To: Michael Sterling <stermic@gw.co.jackson.mo.us>
Cc: pgsql-sql@postgresql.org
Subject: Re: max timestamp
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On Tue, Feb 10, 2004 at 10:14:04 -0800,
  Michael Sterling <stermic@gw.co.jackson.mo.us> wrote:
> i'm trying to get the max time stamp, from each day, of a range of
> dates, not just the max time stamp for the complete range dates but
> for each day.

SELECT DISTINCT ON can probably do what you want. Something like:
SELECT DISTINCT ON (timestamp::DATE) * FROM table ORDER BY timestamp DESC;

This won't produce any records for days where there are no timestamps.