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List:       postgresql-general
Subject:    Re: [GENERAL] question about age()
From:       Andreas Kretschmer <akretschmer () spamfence ! net>
Date:       2013-08-30 7:43:53
Message-ID: 20130830074353.GA8364 () tux
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Tom Lane <tgl@sss.pgh.pa.us> wrote:

> Andreas Kretschmer <akretschmer@spamfence.net> writes:
> > '3 years' != '2 years 11 mons 30 days', but i got 0 rows, why?
> 
> Well, actually:
> 
> regression=# select '3 years'::interval = '2 years 11 mons 30 days'::interval;
>  ?column? 
> ----------
>  t
> (1 row)
> 
> IIRC, interval comparison operators normalize the two values assuming that
> 1 month = 30 days.  Which is kind of arbitrary, but without some such
> assumption there's no way to have a scalar ordering of intervals at all.

Thanks, okay, make sense. I'm using extract() to extract and compare the
YEAR-field to spot a birthday from the age() ;-)


Andreas
-- 
Really, I'm not out to destroy Microsoft. That will just be a completely
unintentional side effect.                              (Linus Torvalds)
"If I was god, I would recompile penguin with --enable-fly."   (unknown)
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