* Tom Lane <tgl@sss.pgh.pa.us> [010602 09:19]:
> Larry Rosenman <ler@lerctr.org> writes:
> > where early >= '2001-01-01 00:00:00' and
> > early <= '2001-01-02 05:59:59'
>
> > BUT, I'm wondering if there is an easy way to generate the obvious
> > where clauses automatically?
>
> Assuming this is being fired from a cron job started at or just after
> each interval, you could do something with date_trunc:
>
> regression=# select now();
> now
> ------------------------
> 2001-06-02 10:12:37-04
> (1 row)
>
> regression=# select date_trunc('hour', now());
> date_trunc
> ------------------------
> 2001-06-02 10:00:00-04
> (1 row)
>
> regression=# select date_trunc('hour', now()) - '6 hours'::interval;
> ?column?
> ------------------------
> 2001-06-02 04:00:00-04
> (1 row)
>
> Or, if you're running the script once a day at midnight, use
> current_date (or equivalently date_trunc('day',...)) and subtract
> appropriate intervals from that.
Thanks, Tom!
You are Terrific!
One more question, will the sum() on a bigint column cast to float
happen in floating point?
I hope so! This data is huge numbers!
Thanks again for always answering most of my queries.
LER
>
> regards, tom lane
>
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>
--
Larry Rosenman http://www.lerctr.org/~ler
Phone: +1 972-414-9812 E-Mail: ler@lerctr.org
US Mail: 1905 Steamboat Springs Drive, Garland, TX 75044-6749
