Re: Interval->day proposal

Michael,

> One advantage of this is that it would allow '1 day' to have a
> different meaning that '24 hours', which would be meaningful when
> crossing daylight saving time changes. For example, PostgreSQL
> returns the following results:

I've been stumping for this for years. See my arguments with Thomas Lockhart
in 2000. A "calendar day" is not the same as 24 hours, and DST behavior has
forced me to use TIMESTAMP WITHOUT TIME ZONE on many a calendaring
application.

Unfortunately, it appears that tri-partitioning INTERVAL ( year/month ;
week/day ; hour/minute/second ) is a violation of the SQL spec which has only
the two partitions ( year/month ; week/day/hour/minute/second ). Have they
changed this in SQL 2003? If not, do we want to do it anyway, perhaps
using a 2nd interval type?

--
Josh Berkus
Aglio Database Solutions
San Francisco