Re: max timestamp

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When grilled further on (10 Feb 2004 10:14:04 -0800),
stermic(at)gw(dot)co(dot)jackson(dot)mo(dot)us (Michael Sterling) confessed:

> 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.
>

Well, one gross and ugly way is:

SELECT MAX( "when" ) FROM readings, (SELECT DATE_TRUNC( 'day', "when" ) AS
period FROM readings GROUP BY period) AS p WHERE DATE_TRUNC( 'day', "when" ) =
p.period GROUP BY p.period;

given the table readings looks something like:

CREATE TABLE readings
(
"when" TIMESTAMP DEFAULT timeofday()::timestamp
NOT NULL PRIMARY KEY
);

I'm curious to see other, 'better' solutions.

Cheers,
Rob

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