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

By Barbara Catania, Lakhmi C. Jain

This study booklet provides key advancements, instructions, and demanding situations referring to complex question processing for either conventional and non-traditional facts. a unique emphasis is dedicated to approximation and adaptivity matters in addition to to the mixing of heterogeneous facts sources.

The booklet will turn out priceless as a reference publication for senior undergraduate or graduate classes on complex facts administration concerns, that have a unique specialise in question processing and information integration. it's aimed for technologists, managers, and builders who need to know extra approximately rising traits in complex question processing.

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Nantajeewarawat, E. ) DASFAA 2007. LNCS, vol. 4443, pp. 551– 562. : Consistency Check Algorithms for MultiDimensional Preference Trade-Offs. : Efficient Skyline Refinement Using Trade-Offs Respecting Don’t-Care Attributes. International Journal of Computer Science and Applications (IJCSA) 6, 1–29 (2009) Chapter 3 Processing Framework for Ranking and Skyline Queries Seung-won Hwang Abstract. In the previous chapter, the need to support ranking and skyline queries for multi-criteria decision-making for given user preferences was motivated.

Accordingly, SKYRANK presents algorithms for efficiently constructing skyline graphs and applies a link-analysis algorithm similar to PageRank in order to compute scores for each skyline object. These scores can be used to select a ranked list of the most interesting skyline objects. Furthermore, the algorithm can be personalized by providing top-k-style weightings for all of the involved subspaces, thus allowing for an either user agnostic or personalized retrieval model. 3 k Most Representative Skyline Points In contrast to the previous approaches which rely on the nature of subspace skylines, the following approach aims at summarizing a skyline by using the most representative skyline points (RSP) [33].

Then two completely similar objects with one being red and the other being yellow would be incomparable, and both could be potential skyline objects. 3 Relaxing the Pareto Semantics As we already argued, the major problem of skyline queries are the often unmanageable result sets possibly dumping thousands of items on the user for manual inspection. Considering the definition of Pareto semantics, it is obvious that the manageability problems of skylines are heavily aggravated by incomparable attribute values.

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