Research Issues in Structured and Semistructured Database by Luca Cardelli (auth.), Richard Connor, Alberto Mendelzon

By Luca Cardelli (auth.), Richard Connor, Alberto Mendelzon (eds.)

This booklet constitutes the completely refereed post-proceedings of the seventh foreign Workshop on Database Programming Languages, DBPL'99, held in Kinloch Rannoch, united kingdom in September 1999. The 17 revised complete papers provided including an invited paper have been conscientiously reviewed and revised for inclusion within the ebook. The e-book offers topical sections on querying and question optmization; languages for record versions; patience, elements and workflows; typing and querying semistructured info; lively and spatial databases; and unifying semistructured and conventional information versions.

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In STOC 1977. S. Chaudhuri, M. Vardi. Optimization of real conjunctive queries. In PODS 1993. C. Chekuri, A. Rajaraman. Conjunctive query containment revisited. In ICDT 1997. S. S. Cosmadakis. Database theory and cylindric lattices. In IEEE Conf. on Foundations of Computer Science 1987. U. Dayal. Of nests and trees: a uni ed approach to processing queries that contain nested subqueries, aggregates, and quanti ers. In VLDB 1987. P. Dublish, J. Biskup, Y. Sagiv. Optimization of a subclass of conjunctive queries.

Examples include all queries de nable in a variety of classical query languages, such as relational calculus, datalog, and the while-loop language. The criteria for permissible update are restricted to the insertion and deletion of a single tuple into an input relation. While the informal de nition given above is su cient for understanding the results of the paper, we give a formal de nition of IESL, as in 19 , which is very similar to the de nitions of FOIES 7 and Dyn-C 21 . Suppose the types of relations of the input database are frt 1 g frt m g, where rt 1 rt m are record types of the form   .

On Foundations of Computer Science 1987. U. Dayal. Of nests and trees: a uni ed approach to processing queries that contain nested subqueries, aggregates, and quanti ers. In VLDB 1987. P. Dublish, J. Biskup, Y. Sagiv. Optimization of a subclass of conjunctive queries. In ICDT 1990. R. Fagin. Horn clauses and database dependencies. JACM 294, 1982. R. Ganski, H. Wong. Optimization of nested SQL queries revisited. In SIGMOD 1987. V. Harinarayan, A. Gupta. Generalized projections: a powerful query-optimization technique.

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