Re: question about age()

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
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