In 2013, Chris Date published a book about the view update problem in the context of the Relational Model. He presented several detailed examples of different varieties of view updates and characterised their behaviour, in the process deriving a set of principles for updating views based on the notion of information equivalence of view schemas. In this seminar I discuss some work in progress looking at how Date's operational definition of information equivalence can be more formally characterised using Hull's concept of relative information capacity, and show how we can model the information equivalence of a view update schema using an extension of Miller's schema intension graph formalism.
Last modified: Monday, 15-Aug-2016 15:47:14 NZST
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