Oracle FAQ Your Portal to the Oracle Knowledge Grid
HOME | ASK QUESTION | ADD INFO | SEARCH | E-MAIL US
 

Home -> Community -> Usenet -> comp.databases.theory -> Re: Relation Schemata vs. Relation Variables

Re: Relation Schemata vs. Relation Variables

From: Erwin <e.smout_at_myonline.be>
Date: 21 Aug 2006 01:57:05 -0700
Message-ID: <1156150625.141893.273410@b28g2000cwb.googlegroups.com> 





>

> I think a transition constraint must be defined as a relational

> expression in the general form of some join between t and t'.

>




"Suppliers with status 20 cannot be deleted."



I think this is indeed an example of a transition constraint.  Can this
be expressed using just JOIN ?
Received on Mon Aug 21 2006 - 03:57:05 CDT












Original text of this message













  HOME |
  ASK QUESTION |
  ADD INFO |
  SEARCH |
  E-MAIL US