Re: Intervals and ISO 8601 duration

On Fri, Jan 13, 2023 at 3:03 PM Adrian Klaver <adrian(dot)klaver(at)aklaver(dot)com>
wrote:

>
> WITH inters AS (
> SELECT
> '1 day 2 hours'::interval AS i1,
> '26 hours'::interval AS i2,
> justify_interval('1 day 2 hours'::interval) AS ij1,
> justify_interval('26 hours'::interval) AS ij2
> )
> SELECT
> *,
> to_char(justify_interval(i1),'HH24:MM:SS') AS i1_char,
> to_char(justify_interval(i2),'HH24:MM:SS') AS i2_char,
> i1=i2 AS "Equal?"
>
> i1 | i2 | ij1 | ij2 | i1_char
> | i2_char | Equal?
>
> ----------------+----------+----------------+----------------+----------+----------+--------
> 1 day 02:00:00 | 26:00:00 | 1 day 02:00:00 | 1 day 02:00:00 | 02:00:00
> | 02:00:00 | t
>
>
I'm not quite sure what this is meant to convey. Maybe justify_hours and
justify_days will return something that uniquely maps to the raw data, and
maybe it doesn't (I can't figure that out!). But then there's still no
justify_seconds or something that would get at the raw microseconds being
stored.

And I could be wrong, but it seems like you were aiming towards making
these two intervals the same. I was trying to zero in on the
opposite--what is it that makes them different (not identical), and how to
access that information. I was assuming that if they were not identical,
the internal representation in Months, Days and Microseconds must be
different--maybe that assumption is not valid. And maybe there is
currently no way to get that raw representation. If that's the case, so be
it, although I might then put in a small plug for it as a feature request.
:) (*)

Cheers,
Ken

(*) These are probably bad suggestions, but something like...

EXTRACT ( (RAWHOURS|RAWDAYS|RAWMICROSECONDS) ... ?
Or a function RAWEXTRACT( HOURS|DAYS|MICROSECONDS ) ?

--
> Adrian Klaver
> adrian(dot)klaver(at)aklaver(dot)com
>
>

--
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