'Multi valued attribute' diaporamas de présentation

COP 4710: Database Systems Fall 2013

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Advanced Data Modeling

Classification. Instantiation. Identification. Subclasses. Superclasses. EER-to-Relational Mapping. Discriminator. Advanced Data Modeling. Attribute inheritance. Constraints. Specialization. Aggregation. Hierarchy. Generalization. Association. Lattice. Category. Specialization.

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From ER to Tables

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ERD

ERD. Translation to tables. A Table Example. t1 = ( foo,bar,baz,x ) t2 = ( quz,bar,foo,y ) t1[a1] = ( baz ) t2[a2] = ({ y,z }) t1[a?] = ( baz ,{ x,y }) t2[ k ?] = ( quz,bar ). t1. t2. Vector of all key attributes. k? = (k1,k2) a? = (a1,a2). Vector of all non-key attributes.

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ER-to-Relational Mapping Principles

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