taxonomy for constraints?
From: Marshall Spight <marshall.spight_at_gmail.com>
Date: 4 Sep 2005 16:43:18 -0700
Message-ID: <1125877398.138729.87710_at_z14g2000cwz.googlegroups.com>
Hi all,
Date: 4 Sep 2005 16:43:18 -0700
Message-ID: <1125877398.138729.87710_at_z14g2000cwz.googlegroups.com>
Hi all,
Does anyone know of any interesting constraint taxonomies?
I am aware of
1) D&D's domain/column/table/database hierarchy, which is
There are other kinds of things in the relational world, as well.
Foreign keys
uniqueness constraints
functional dependencies
Yet another dimension:
universal vs. existential quantification
Yet another kind of beast:
constaints that use aggregate functions
Anyone care to discuss how these all fit together? Anyone know of any formal treatment of these?
Marshall Received on Mon Sep 05 2005 - 01:43:18 CEST