Titlebook: Conceptual Modeling - ER ‘97; 16th International C David W. Embley,Robert C. Goldstein Conference proceedings 1997 Springer-Verlag Berlin H

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Taisir E. H. El-Gorashi,J. M. H. Elmirghaniat allows users to formulate queries naturally in terms of elementary relationships, operators such as “and”, “or”, “not” and “maybe”, contextual for clauses and object-correlation, thus avoiding the need to deal explicitly with implementation details such as relational tables, null values, outer jo

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Erratum to: Towards Digital Optical Networks being violated by a database transaction these systems trigger repairing actions. However, it has been shown that for any set of constraints there exist unrepairable transactions, which depend on the closure of the constraint set. Even if unrepairable transactions are excluded, this does not restra