We discuss a declarative framework for updating views over indefinite databases. An indefinite database is a database with null values that are represented, following the standard database approach, by a single null constant. The key aspects of our approach are the basic setup in which extensional databases are indefinite both before and after an update, a novel representation of indefinite databases, and several new classes of view repairs. Most notable is the class of constrained repairs that change the database "minimally" and avoid making arbitrary commitments.
The view-update problem for indefinite databases
Caroprese L.;
2013-01-01
Abstract
We discuss a declarative framework for updating views over indefinite databases. An indefinite database is a database with null values that are represented, following the standard database approach, by a single null constant. The key aspects of our approach are the basic setup in which extensional databases are indefinite both before and after an update, a novel representation of indefinite databases, and several new classes of view repairs. Most notable is the class of constrained repairs that change the database "minimally" and avoid making arbitrary commitments.File in questo prodotto:
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