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 <bruce@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 +
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