From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
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To: | Achilleas Mantzios <achill(at)matrix(dot)gatewaynet(dot)com> |
Cc: | Julius Tuskenis <julius(at)nsoft(dot)lt>, pgsql-admin(at)postgresql(dot)org |
Subject: | Re: how to get a number of seconds in some interval ? |
Date: | 2008-05-12 15:09:11 |
Message-ID: | 20080.1210604951@sss.pgh.pa.us |
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Achilleas Mantzios <achill(at)matrix(dot)gatewaynet(dot)com> writes:
> Monday 12 May 2008 17:32:39 / Julius Tuskenis :
>> do you know why division of intervals was not implemented? As I see it -
>> there should be an easy way to do so. '1 hour 30 minutes' / '1 hour' =
>> 1.5 .... Seems straight forward...
>>
> No idea why. However as you pose it,it makes sense.
No, it doesn't really, because intervals contain multiple components.
What would you define as the result of
'1 month 1 hour' / '1 day'
bearing in mind that the number of days per month is not fixed, and
neither is the number of hours per day?
You can derive a number if you're willing to make arbitrary assumptions
about the relationships of the different units (as indeed extract(epoch)
does), but hard-wiring such assumptions into a basic arithmetic operator
doesn't seem like a good idea to me.
regards, tom lane
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