Titlebook: An Extended Entity-Relationship Model; Fundamentals and Pra Martin Gogolla Book 1994 Springer-Verlag Berlin Heidelberg 1994 Constraint.Data

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Der Inflationseinflu? auf die Planungand aggregation functions; algebraic specification of operations and predicates induced by sort expressions; user-defined aggregates; extended Entity-Relationship schemas; entity and relationship types; attributes; components; construction types; graphical representation; role names; comparison to other data models.

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Der Inflationseinflu? auf die Planung safeness of the extended Entity-Relationship calculus; relational completeness of the extended Entity-Relationship calculus; relationship and value dependent joins; equivalence rules for calculus expressions; integrity constraints; case study: specification of extended Entity-Relationship schemas within the extended Entity-Relationship approach.

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Book 1994tational power of the proposedcalculus.The extended Entity-Relationship calculus is used todefinethe meaning of the relational query language SQL. A nicefeature of the approach is that it becomes possible to provelanguage properties on a sound mathematical basis.

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Book 1994tion to theprimitives given by the data model the text introduces alanguage for the formulation of constraints in order torestrict database states to consistent ones. The textexplains animplementation of the approach chosen in thelogic programing languagePROLOG and discusses in thiscontext the compu

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