On 5/17/07, Tom Lane <[EMAIL PROTECTED]> wrote:


"Andrew Hammond" <[EMAIL PROTECTED]> writes:
> On 5/17/07, Tom Lane <[EMAIL PROTECTED]> wrote:
>> What are the grounds for defining it that way rather than some other
>> way?

> The only alternative that came to mind when I wrote it was using a
numeric
> instead of float.

No, I'm wondering what's the justification for smashing it to a single
number at all, when the inputs are three-field values.  Interval divided
by float doesn't produce just a float, for example.



I think I see what you're getting at here. '1 month' / '1 day' could return
a number of reasonable values depending on how many days are in the month
(28 to 31) and on how many hours are in a day (generally 24, but can be 23
or 25 for DST adjustments). The definition above simply assumes that
EXTRACT(epoch...) does the Right Thing. Hmmm. I'm at a loss for the right
way to solve this. It seems very reasonable to want to divide intervals by
intervals (how many nanocenturies in a fortnight?), but I'm at a loss for
how to do that correctly. I'll read the code from EXTRACT(epoch...) and see
what happening there.

Andrew

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