| From: | Jeff Davis <pgsql(at)j-davis(dot)com> |
|---|---|
| To: | Heikki Linnakangas <heikki(at)enterprisedb(dot)com> |
| Cc: | Greg Smith <gsmith(at)gregsmith(dot)com>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: FW: bitemporal functionality for PostgreSQL |
| Date: | 2008-02-04 22:25:23 |
| Message-ID: | 1202163923.10057.817.camel@dogma.ljc.laika.com |
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| Lists: | pgsql-hackers |
On Mon, 2008-02-04 at 20:50 +0000, Heikki Linnakangas wrote:
> Jeff Davis wrote:
> > Also, they use "period" to mean interval, and "interval" to mean
> > duration -- which is wrong, in my opinion; interval already has a well-
> > defined mathematical meaning.
>
> Agreed, but that mistake actually originates from the SQL standard. The
> SQL INTERVAL data type is really a duration, so I guess they had to come
> up with a new term for interval in the mathematical meaning.
Fair enough. However, that is just an example of the SQL idiosyncrasies
that I was referring to.
I think that kind of thing gets in the way a lot more than it helps,
which is why I found Temporal Data and the Relational Model so
refreshing.
Regards,
Jeff Davis
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