Re: trying to summarize into a new table by time...

* Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> [010602 09:19]:
> Larry Rosenman <ler(at)lerctr(dot)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
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