From: | Julius Tuskenis <julius(at)nsoft(dot)lt> |
---|---|
To: | |
Cc: | pgsql-admin(at)postgresql(dot)org |
Subject: | Re: how to get a number of seconds in some interval ? |
Date: | 2008-05-13 06:20:09 |
Message-ID: | 48293319.2000201@nsoft.lt |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-admin |
Thank you, it's now clear to me.
Tom Lane rašė:
> Achilleas Mantzios <achill(at)matrix(dot)gatewaynet(dot)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
From | Date | Subject | |
---|---|---|---|
Next Message | Achilleas Mantzios | 2008-05-13 06:56:50 | Re: how to get a number of seconds in some interval ? |
Previous Message | Tom Lane | 2008-05-12 17:55:22 | Re: context switch storm in 8.1.4 on Xeon XP |