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On Wed, Nov 04, 2009 at 09:47:03AM -0800, Jeff Davis wrote:
> On Wed, 2009-11-04 at 12:08 -0500, Chris Browne wrote:
> > I'm
> > a lot less certain about the merits of PK/FK constraints - it is a lot
> > less obvious what forms of constraints will be able to be applied to
> > particular applications.
>
> Can you clarify, a little?
>
> A temporal key just means "non-overlapping periods of time", and that
> has a very clear meaning with respect to scheduling.
That would be the main application, I imagine. But "contained in" (and
its reverse) seem good candidates as well. As might be "befoe" and
"after", strictly or not.
Regards
- -- tomás
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