| From: | "David G(dot) Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com> |
|---|---|
| To: | Paul Linehan <linehanp(at)tcd(dot)ie> |
| Cc: | "pgsql-novice(at)postgresql(dot)org" <pgsql-novice(at)postgresql(dot)org> |
| Subject: | Re: Help with SQL updating not working. |
| Date: | 2015-05-18 22:24:12 |
| Message-ID: | CAKFQuwayy0KcAhaKDv4wpaALBPLcJXk040UMXxkZ7LGBwuFhVQ@mail.gmail.com |
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| Lists: | pgsql-novice |
On Mon, May 18, 2015 at 1:27 PM, Paul Linehan <linehanp(at)tcd(dot)ie> wrote:
>
> Now, into the time_diff field, I want to insert the time difference in
> seconds
>
> I've tried various combinations of this
>
> update the_times as set time_diff = extract ('epoch' from
> (the_times.time2 - the_times.time1)::interval) from the_times;
>
> but to no avail.
>
> Could any kind soul help me out on this?
>
>
SELECT extract('epoch' FROM te) - extract('epoch' FROM ts)
FROM (
VALUES ( '08:34:21'::time, '09:34:21'::time)
) tm (ts, te)
epoch ARE seconds; just subtract them directly.
David J.
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