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An Extended Entity-Relationship Model: Fundamentals and Pragmatics (Lecture Notes in Computer Science)

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Studying modern database languages one recognizes that there is a gap between language features and theoretical foundations:

* Studies of the formal foundations exist for the relational data model but not for the Entity-Relationship model, which is a model used by numerous practical people. Also, most extensions of the Entity-Relationship model and other semantic data models lack a precise formal description.

* Certain features of database query languages such as aggregation or grouping are offered by the corresponding database systems but the theoretical foundations in terms of algebras or calculi frequently neglect these features.

This text presents a comprehensive introduction to an extended Entity-Relationship model both on a conceptual and on a formal, mathematicallevel. In addition to the primitives given by the data model the text introduces a language for the formulation of constraints in order to restrict database states to consistent ones. The text explains an implementation of the approach chosen in the logic programing language PROLOG and discusses in this context the computational power of the proposedcalculus. The extended Entity-Relationship calculus is used to define the meaning of the relational query language SQL. A nice feature of the approach is that it becomes possible to prove language properties on a sound mathematical basis.

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