Re: Why overlaps is not working - Mailing list pgsql-general

From Richard Broersma Jr
Subject Re: Why overlaps is not working
Date
Msg-id 535796.91043.qm@web31809.mail.mud.yahoo.com
Whole thread Raw
In response to Re: Why overlaps is not working  ("Andrus" <eetasoft@online.ee>)
List pgsql-general
> > apparently date doesn't know anything about infinity.  However, from what
> > I've read in my "SQL for
> > smarties" book regarding temporial database design, unknown future dates
> > were stored as:
> > '9999-12-31'
> >
> > Would this help, since any enddate with this value would be be enterpreted
> > as an enddate that has
> > not yet occured?  when you arrive at the date for records effective period
> > to close just update
> > the enddate to the today's date.
>
> select date '10000-1-1'< date '99991231'
> return false.
> If my database contains dates greater than DATE  '9999-12-31' then this
> check fails.
> This is why I'm searching for a real MAX_DATE value in Postgres.
> It would be nice if there will be MAX_DATE constant in Postgres or some one
> row system table contains MAX_DATE value.

That is very interesting, but would you really expect to record dates greater than the year 9999?
:o)

Regards,

Richard Broersma Jr.

pgsql-general by date:

Previous
From: Andreas Kretschmer
Date:
Subject: Re: specify whitch index to use
Next
From: Tom Lane
Date:
Subject: Re: join condition against where with coalesce