2006 1st International Conference on Digital Information Management 2007
DOI: 10.1109/icdim.2007.369356
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A Bottom-up Strategy for Query Decomposition

Abstract: In order to access data from various different data repositories, in Global-As-View approaches an input query is decomposed into several subqueries. Normally, this decomposition is based on a set of mappings, which describe the correspondence of data elements between a global schema and local ones. However, building mappings is a difficult task, especially when the number of participating local schemas is large. In our approach, an input query is automatically decomposed into subqueries without using mappings.… Show more

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