From: Julius Tuskenis <julius@nsoft.lt>
Cc: pgsql-admin@postgresql.org
Subject: Re: how to get a number of seconds in some interval ?
Date: Tue, 13 May 2008 09:20:09 +0300
Message-ID: <48293319.2000201@nsoft.lt> (raw)
In-Reply-To: <20080.1210604951@sss.pgh.pa.us>
References: <482849B0.6050103@nsoft.lt>
<200805121724.38772.achill@matrix.gatewaynet.com>
<48285507.4010007@nsoft.lt>
<200805121801.35101.achill@matrix.gatewaynet.com>
<20080.1210604951@sss.pgh.pa.us>
Thank you, it's now clear to me.
Tom Lane rašė:
> Achilleas Mantzios <achill@matrix.gatewaynet.com> writes:
>
>> Στις Monday 12 May 2008 17:32:39 ο/η Julius Tuskenis έγραψε:
>>
>>> 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
>
>
--
Julius Tuskenis
Programavimo skyriaus vadovas
UAB nSoft
mob. +37068233050
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Subject: Re: how to get a number of seconds in some interval ?
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