Re: Proposal - temporal contrib module
От | tomas@tuxteam.de |
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Тема | Re: Proposal - temporal contrib module |
Дата | |
Msg-id | 20091105083310.GA11172@tomas обсуждение исходный текст |
Ответ на | Re: Proposal - temporal contrib module (Jeff Davis <pgsql@j-davis.com>) |
Список | pgsql-hackers |
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 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 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) iD8DBQFK8o3GBcgs9XrR2kYRAjWOAJ4lrIjJxf1UAN4tyXaVhGtlLGt8SgCeKJje AvC6Kce87NU3nyOz82ccXaQ= =Lrk8 -----END PGP SIGNATURE-----
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