From: Tom Lane <tgl@sss.pgh.pa.us>
To: Achilleas Mantzios <achill@matrix.gatewaynet.com>
Cc: pgsql-admin@postgresql.org, Julius Tuskenis <julius@nsoft.lt>
Subject: Re: how to get a number of seconds in some interval ?
Date: Tue, 13 May 2008 10:15:27 -0400
Message-ID: <24656.1210688127@sss.pgh.pa.us> (raw)
In-Reply-To: <200805130956.51872.achill@matrix.gatewaynet.com>
References: <482849B0.6050103@nsoft.lt>
<200805121801.35101.achill@matrix.gatewaynet.com>
<20080.1210604951@sss.pgh.pa.us>
<200805130956.51872.achill@matrix.gatewaynet.com>
Achilleas Mantzios <achill@matrix.gatewaynet.com> writes:
> So it seems that the arbitary assumption of (1 month=30 days, and 1 day = 24 hours) has already been made in the extract function.
Right, as I said:
>> 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),
The point is that we don't want to propagate that bogus assumption
further than we have to. EXTRACT() already implies loss of information,
so it's reasonable for it to deliver a simplified view of reality, but
it doesn't follow that division should.
regards, tom lane
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To: pgsql-admin@postgresql.org
Cc: tgl@sss.pgh.pa.us, achill@matrix.gatewaynet.com, julius@nsoft.lt
Subject: Re: how to get a number of seconds in some interval ?
In-Reply-To: <24656.1210688127@sss.pgh.pa.us>
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