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By Richard Hull, Bharat Kumar, Arnaud Sahuguet, Ming Xiong (auth.), Barry Eaglestone, Siobhán North, Alexandra Poulovassilis (eds.)

ISBN-10: 3540439056

ISBN-13: 9783540439059

This e-book constitutes the refereed lawsuits of the nineteenth British nationwide convention on Databases, BNCOD 2002, held in Sheffield, united kingdom, in July 2002.
The 10 revised complete papers and nine posters provided including one invited paper have been conscientiously reviewed and chosen for inclusion within the quantity. The publication bargains topical sections on question processing, info warehousing and knowledge mining, caliber and integrity, and net and dispensed databases.

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Extra info for Advances in Databases: 19th British National Conference on Databases, BNCOD 19 Sheffield, UK, July 17–19, 2002 Proceedings

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Rc . 1. r = (rAB ˆ rAC )∪ ˆ A,B (rc ). ˆ ˆΠ 2. ΠA,B (r) ≡ rAB ∪ Part 1 shows how an instance can be decomposed using AFD A → B. This result forms the basis of our first rewriting technique. Part 2 shows how the decomposition can be simplified if C is not needed. This result forms the basis of our second rewriting technique. Later, we will discuss the second technique and the setting in which it is applied. In that setting, it will be made clear why we only need set equivalence (≡) rather than equality (=).

12. , and Vassiliou Y. An optimizing PROLOG front-end to a relational query system. In Proc. , pages 296–306, 1984. 13. , and Siirtola H. Discovering functional and inclusion dependencies in relational databases. International Journal of Intelligent Systems, 7:591– 607, 1992. 14. King J. QUIST–A system for semantic query optimization in relational databases. In Proc. of the 7th International Conf. on Very Large Data Bases Cannes, pages 510–517, Cannes, France, Sept. 1981. IEEE Computer Society Press.

There are a number of directions for future work. 1. Address the primary drawback to Technique II: it is guaranteed to preserve correctness only on JE-rewritable queries. In particular, modify our approach to handle aggregate operations like count and sum. This can be achieved by modifying the construction of r AB to keep counts. The significant issue is then sharpened: how to rewrite queries to use the counts. 2. Investigate extending Technique I to push selections and projections into the decomposition.

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Advances in Databases: 19th British National Conference on Databases, BNCOD 19 Sheffield, UK, July 17–19, 2002 Proceedings by Richard Hull, Bharat Kumar, Arnaud Sahuguet, Ming Xiong (auth.), Barry Eaglestone, Siobhán North, Alexandra Poulovassilis (eds.)


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