When grilled further on (Mon, 19 Jan 2004 00:44:30 -0500),
Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> confessed:
> Robert Creager <Robert_Creager(at)LogicalChaos(dot)org> writes:
> > ... one piece of data I need is the last value for each GROUP BY
> > period. Alas, I cannot figure out how to do this.
> SELECT DISTINCT ON (rather than GROUP BY) could get this done for you.
I had my whine all ready as to how I still couldn't figure it out, when I
figured it out:
SELECT p.period, etday
FROM (SELECT DISTINCT ON ( period )
date_trunc( 'hour', "when" ) AS period,
ORDER BY period, "when" DESC) AS p
Thanks for the tip.
08:10:55 up 21 days, 21:58, 4 users, load average: 2.15, 2.06, 2.02
In response to
pgsql-sql by date
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