Titlebook: Entity-Relationship Approach - ER ‘93; 12th International C Ramez A. Elmasri,Vram Kouramajian,Bernhard Thalhei Conference proceedings 1994

小說

Gordon Slethaug,Jesilin Manjuladomain concept hierarchy is constructed on top of a numerical domain to handle imprecise data, while dependencies between database attributes are derived for incomplete information. An application of the techniques for processing queries under network partitioning is also discussed.

ALE

河流

consent

Neighborhood/conceptual query answering with imprecise/incomplete data,domain concept hierarchy is constructed on top of a numerical domain to handle imprecise data, while dependencies between database attributes are derived for incomplete information. An application of the techniques for processing queries under network partitioning is also discussed.

Indigence

Gralf-Peter Calliess,Stephan von Harder constraints are business model integrity constraints and rules captured in the business analysis. They specify existence and value relations among predicates. The constraints are specified in a proposed declarative language based on First Order Logic. They can then be translated into the relational algebra and SQL.

NOTCH

https://doi.org/10.1007/978-3-319-02570-4 dependency for temporal databases that include object-identity. The proposed extensions are used to compare object-oriented modeling and Extended Entity-Relationship modeling in structural and temporal terms.

增強(qiáng)

https://doi.org/10.1057/978-1-137-58644-5tions to model various notions of time for different applications. We discuss the temporal semantics of inheritance by defining a lifespan behavior on objects in a collection. Finally, we give an elaborative example and show that temporal objects can be queried without adding any extra construct to the underlying query language.

Postulate

Fibrinogen

cancer

Functional dependencies generalized for temporal databases that include object-identity, dependency for temporal databases that include object-identity. The proposed extensions are used to compare object-oriented modeling and Extended Entity-Relationship modeling in structural and temporal terms.