On Wed, 20 Jun 2018 at 15:12, Bruce Momjian <br...@momjian.us> wrote:

> On Tue, Jun 19, 2018 at 11:58:39PM -0400, Bruce Momjian wrote:
> > On Tue, May 22, 2018 at 10:55:14AM +0000, PG Doc comments form wrote:
> > >
> https://stackoverflow.com/questions/50465632/postgresql-10-4-date-difference/50465676#50465676
> >
> > This is really a function of how interval computes months, days, and
> > seconds from subtraction, which is outlined here:
> >
> >
> https://www.postgresql.org/docs/10/static/datatype-datetime.html#DATATYPE-INTERVAL-INPUT
> >
> > I don't think adding something to the functions-datetime.html section
> > makes sense.  For example, this returns 1:
> >
> >       SELECT extract(minutes from '1 hour 1 minute'::interval);
> >        date_part
> >       -----------
> >                1
>
> Thinking some more, I wonder if this behavior should be more clearly
> documented:
>
>         SELECT EXTRACT(hours from '80 minutes'::interval);
>          date_part
>         -----------
>                  1
>
>         SELECT EXTRACT(days from '80 hours'::interval);
>          date_part
>         -----------
>                  0
>
> To me, this clearly shows the behavior of the months, days, and seconds
> components.  I have developed the attached doc patch to mention this.
>
> --
>   Bruce Momjian  <br...@momjian.us>        http://momjian.us
>   EnterpriseDB                             http://enterprisedb.com
>
> + As you are, so once was I.  As I am, so you will be. +
> +                      Ancient Roman grave inscription +
>

Yes, it covers my question great. Thank you

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