Download Advanced Query Processing: Volume 1: Issues and Trends by Barbara Catania, Lakhmi C. Jain PDF

By Barbara Catania, Lakhmi C. Jain

This learn e-book offers key advancements, instructions, and demanding situations referring to complicated question processing for either conventional and non-traditional facts. a unique emphasis is dedicated to approximation and adaptivity concerns in addition to to the combination of heterogeneous information sources.

The ebook will turn out worthy as a reference ebook for senior undergraduate or graduate classes on complicated information administration concerns, that have a distinct concentrate on question processing and knowledge integration. it truly is aimed for technologists, managers, and builders who need to know extra approximately rising tendencies in complicated question processing.

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Additional info for Advanced Query Processing: Volume 1: Issues and Trends

Example text

At different prices, why should one want to consider the more expensive car? , “lower prices are better than higher prices given that all other attributes are equal”). , on colors, “given two cars with free color choice, a black car would be better than a red car”) which are usually modeled as partial or weak orders [5,6]. , preferences on price; no reasonable user would prefer the same object for a higher price). This focus on individual attribute domains and the complete fairness of the Pareto paradigm are the major advantages of skyline queries: they are easy to specify and the algorithm will only remove definitely suboptimal objects.

To compute this recursive concept of interestingness, SKYRANK relies on the notion of a skyline graph. The skyline graph contains all skyline objects of the full data space as nodes. The edges are constructed using the skycube of a dataset. For every skyline object of the full dimensional space (the nodes of the graph), each subspace of the skycube is tested if is part of the corresponding subspace skyline. If it is, no edge is added. However, if is not part of the subspace skyline, a directed edge is added from to all objects which dominate with respect to the current subspace.

Assessing a preference for the values in domains of each attribute, users can provide a set of up to complex attribute preferences to personalize the skyline retrieval process: • • A preference on an attribute with domain is a strict partial order is preferred to some other value over . If some attribute value , then , . This is often written as (read “ dominates wrt. to ”). , no tuple in may contradict a relation on tuple in the transitive closure of ). If two attribute values , are , we write .

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