Re: Proposal: 6NF
From: Cimode <cimode_at_hotmail.com>
Date: 12 Oct 2006 03:38:08 -0700
Message-ID: <1160649488.429018.158070_at_c28g2000cwb.googlegroups.com>
Date: 12 Oct 2006 03:38:08 -0700
Message-ID: <1160649488.429018.158070_at_c28g2000cwb.googlegroups.com>
Relations can be defined to work as follows:
> A domain D1 presents severals values and operators applyable on these values.
> A un-ary relation R1 extracts and RESTRICTS possible values and operators. Such relation R1 is synonyme with type.
> The method for restricting the values drawn from domain D1 and populate R1 is called a constraint. Such constraint can be of arbitrary complexity.
> The relation value of R1 *consitute* a new derived domain D2 which only include values permissible by the method that restrict (or constraint).
Hope this helps... Received on Thu Oct 12 2006 - 12:38:08 CEST