Re: Relation Schemata vs. Relation Variables

From: "Erwin" <e.smout@xxxxxxxxxxx>
Date: 21 Aug 2006 01:57:05 -0700

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 ?

.

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References:
- Relation Schemata vs. Relation Variables
  - From: Brian Selzer
- Re: Relation Schemata vs. Relation Variables
  - From: David Portas

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