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From: Adrian Klaver <[email protected]>
To: Ron Johnson <[email protected]>
To: pgsql-general <[email protected]>
Subject: Re: INTERVAL MINUTE TO SECOND didn't do what I thought it would do
Date: Wed, 8 Jan 2025 12:07:09 -0800
Message-ID: <[email protected]> (raw)
In-Reply-To: <CANzqJaDvKxd=EU2ofTBm9xyWFPGqCfo8MEnLoOZUZgiS=AK=3w@mail.gmail.com>
References: <CANzqJaAxzAO6ye9r3_T2HA_g1myZTEFH+z7uSzBf57Bh2ykWVg@mail.gmail.com>
	<[email protected]>
	<CANzqJaDvKxd=EU2ofTBm9xyWFPGqCfo8MEnLoOZUZgiS=AK=3w@mail.gmail.com>



On 1/8/25 11:58 AM, Ron Johnson wrote:
> On Wed, Jan 8, 2025 at 2:43 PM Adrian Klaver <[email protected] 
> <mailto:[email protected]>> wrote:
> 

>      > I'd hoped that ::INTERVAL MINUTE TO SECOND would do the trick, but
>      > MINUTE TO SECOND seems to be ignored.
> 
>       From here:
> 
>     https://www.postgresql.org/docs/current/datatype-datetime.html#DATATYPE-INTERVAL-INPUT <https://www.postgresql.org/docs/current/datatype-datetime.html#DATATYPE-INTERVAL-INPUT;
> 
>     "Also, field values “to the right” of the least significant field
>     allowed by the fields specification are silently discarded. For
>     example,
>     writing INTERVAL '1 day 2:03:04' HOUR TO MINUTE results in dropping the
>     seconds field, but not the day field."
> 
> 
> I read that, but it did not mention that the day values are retained.

I suggest reading the entire section(8.5.4. Interval Input) as well as 
8.5.5. Interval Output.

> 
>      >
>      > Is there cast magic that does what I want?
> 
>     The only way I can think of extract the epoch from the interval and
>     pass
>     to a function that builds what you want.
> 
> 
> I was afraid of that.  Must decide if it's worth the time.
>
If you don't mind decimal minutes, a quick and dirty solution is:

select extract(epoch from (now() - '2025-01-07 14:15:32'::timestamptz)) 
/ 60;

1301.5244606333333333


-- 
Adrian Klaver
[email protected]

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