From: Bruce Momjian <pgman@candle.pha.pa.us>
To: Stephan Szabo <sszabo@megazone.bigpanda.com>
Cc: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Milen A. Radev <milen@radev.net>
Cc: pgsql-sql@postgresql.org
Cc: pgsql-hackers@postgresql.org
Subject: Re: [SQL] Interval subtracting
Date: Wed, 1 Mar 2006 15:18:43 -0500 (EST)
Message-ID: <200603012018.k21KIhi22006@candle.pha.pa.us> (raw)
In-Reply-To: <20060218110129.W9818@megazone.bigpanda.com>
Stephan Szabo wrote:
> > justify_days doesn't currently do anything with this result --- it
> > thinks its charter is only to reduce day components that are >= 30 days.
> > However, I think a good case could be made that it should normalize
> > negative days too; that is, the invariant on its result should be
> > 0 <= days < 30, not merely days < 30.
>
> What about cases like interval '1 month -99 days', should that turn into
> interval '-3 mons +21 days' or '-2 mons -9 days'?
I think it should be the later. It is best to have a single sign, and I
think it is possible in all cases:
'2 mons -1 days'
could be adjusted to '1 mons 29 days'.
--
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. +
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To: pgsql-sql@postgresql.org
Cc: pgman@candle.pha.pa.us, sszabo@megazone.bigpanda.com, tgl@sss.pgh.pa.us, milen@radev.net, pgsql-hackers@postgresql.org
Subject: Re: [SQL] Interval subtracting
In-Reply-To: <200603012018.k21KIhi22006@candle.pha.pa.us>
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