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ICDE
1995
IEEE

Record Subtyping in Flexible Relations by Means of Attribute Dependencies

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Record Subtyping in Flexible Relations by Means of Attribute Dependencies
The model of flexible relations supports heterogeneous sets of tuples in a strongly typed way. The elegance of the standard relational model is preserved by using a single, generic scheme constructor.In each model supporting structural variants the shape of some part of a heterogeneous scheme may be determined by the contents of some other part of the scheme. We formalize this relationship by a certain kind of integrity constraint we have called "attribute dependency" (AD). We motivate how ADs can be used, besides their application in type and integrity checking, to incorporate record subtyping into our extended relational model Moreover, we show that ADs yield a stronger assertion than the traditional record subtyping rule as they consider interdependencies among refinements. We discuss how ADs are related to query processing and how they may help to identify redundant operations.
Christian Kalus, Peter Dadam
Added 01 Nov 2009
Updated 01 Nov 2009
Type Conference
Year 1995
Where ICDE
Authors Christian Kalus, Peter Dadam
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