| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Hannu Krosing <hannu(at)skype(dot)net> |
| Cc: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>, Stephan Szabo <sszabo(at)megazone(dot)bigpanda(dot)com>, "Milen A(dot) Radev" <milen(at)radev(dot)net>, pgsql-sql(at)postgresql(dot)org, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: [SQL] Interval subtracting |
| Date: | 2006-03-01 20:35:28 |
| Message-ID: | 14928.1141245328@sss.pgh.pa.us |
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Hannu Krosing <hannu(at)skype(dot)net> writes:
> But unfortunately '2 mons -1 days' <> '1 mons 29 days'
> If I want something to happen 1 day less than two months from dome date,
> then the only way to say that consistently *is* '2 mons -1 days'.
Sure, but if you want to represent that then you don't pass the value
through justify_days(). The entire premise of justify_days() is that
1 month is interchangeable with 30 days and we should try to make the
value "look nice" given that assumption.
I think everyone's independently arrived at the same thought that
justify_days should not produce a result with different signs for month
and day (except for the case with month = 0, per my last message).
regards, tom lane
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