| From: | Bruno Wolff III <bruno(at)wolff(dot)to> |
|---|---|
| To: | Randall Skelton <skelton(at)brutus(dot)uwaterloo(dot)ca> |
| Cc: | pgsql-general(at)postgresql(dot)org |
| Subject: | Re: returning row numbers in select |
| Date: | 2004-03-10 23:18:40 |
| Message-ID: | 20040310231840.GA10056@wolff.to |
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| Lists: | pgsql-general |
On Wed, Mar 10, 2004 at 17:25:49 -0500,
Randall Skelton <skelton(at)brutus(dot)uwaterloo(dot)ca> wrote:
>
> That would be ideal as it is theoretically possible for there to be
> missing rows due to sampling errors; nevertheless, a WHERE test doesn't
> seem obvious to me. Can you please post an example? The time spacing
> between rows is 1 second but I want my select statement to return rows
> every 5 seconds (see marked lines below). I've tried various interval
> operations but I don't really understand how to relate the timestamp
> and and the interval.
You could extract seconds from timestamp, cast to integer and apply
the mod function and test against whichever remainder you want.
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