From: Bruce Momjian <pgman@candle.pha.pa.us>
Message-Id: <200603012311.k21NBvX06405@candle.pha.pa.us>
Subject: Re: [SQL] Interval subtracting
In-Reply-To: <16750.1141254462@sss.pgh.pa.us>
To: Tom Lane <tgl@sss.pgh.pa.us>
Date: Wed, 1 Mar 2006 18:11:57 -0500 (EST)
CC: Mark Dilger <pgsql@markdilger.com>, pgsql-hackers@postgresql.org
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Type: text/plain; charset=US-ASCII

Tom Lane wrote:
> Bruce Momjian <pgman@candle.pha.pa.us> writes:
> > Tom Lane wrote:
> >> Based on that, I guess I have to change my vote: justify_hours should
> >> still not look at the month (because it shouldn't use the month=30days
> >> assumption), but justify_days should be changed to be effectively a
> >> combination of both functions --- that is, it should fix all three
> >> fields using both the 30days and the 24hours assumptions.  Then it could
> >> guarantee that all come out with the same sign.
> 
> > If we do that, we should just call it justify_interval().  I am thinking
> > this is the direction to go, and for people who want more control they
> > use the justify_hours and justify_days, and those are left unchanged.
> 
> Well, the question is whether justify_days has a sane definition that is
> different from this.  Based on your example, I'm not seeing one.

Uh, justify days only deals with days <--> months conversions.  There is
no processing for hours.  I don't understand your comment.

-- 
  Bruce Momjian   http://candle.pha.pa.us
  SRA OSS, Inc.   http://www.sraoss.com

  + If your life is a hard drive, Christ can be your backup. +