From: Milorad Poluga <milorad.poluga@cores.co.yu>
To: pgsql-sql@postgresql.org
Cc: Milen A. Radev <milen@radev.net>
Subject: Re: Interval subtracting
Date: Sat, 18 Feb 2006 15:36:20 +0100
Message-ID: <200602181536.20605.milorad.poluga@cores.co.yu> (raw)
In-Reply-To: <43F72E27.2060408@radev.net>
References: <200602181444.06009.milorad.poluga@cores.co.yu>
<43F72E27.2060408@radev.net>
On Saturday 18 February 2006 15:24, Milen A. Radev wrote:
> Milorad Poluga написа:
> > Hi all,
> >
> > Is there something incorrect in the above query ?
> > SELECT '10 years 1 mons 1 days'::interval - '9 years 10 mons 15 days'::interval
> >
> > ?column?
> > ---------------
> > 3 mons -14 days
> >
> > Why not '2 mons 16 days' ?
> >
> > /version = PostgreSQL 8.0.4 on i686-pc-linux-gnu, compiled by GCC gcc (GCC) 3.4.2 20041017 (Red Hat 3.4.2-6.fc3) /
>
>
> How many days are there in a month?
>
I beleive that a month is calculated on the 30-days base.
One way to solve this problem is to use a neutal date element and make timestamps :
SELECT age(('1990-01-01'::date + '10 years 1 mons 1 days'::interval)::timestamp ,
('1990-01-01'::date + '9 years 10 mons 15 days'::interval)::timestamp)
age
--------------
2 mons 16 days
Regards,
Milorad Poluga
---------------------------------------
milorad.poluga@cores.co.yu
---------------------------------------
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To: pgsql-sql@postgresql.org
Cc: milorad.poluga@cores.co.yu, milen@radev.net
Subject: Re: Interval subtracting
In-Reply-To: <200602181536.20605.milorad.poluga@cores.co.yu>
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