Schema Mapping as Query Discovery

  • Miller R
  • Haas L
  • Hernández M
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Abstract

To enable modern data intensive applications including data warehousing, global information systems and electronic commerce, we must solve the schema mapping problem in which a source (legacy) database is mapped into a different, but fixed, target schema. Schema mapping involves the discovery of a query or set of queries that transform the source data into the new structure. We introduce an interactive mapping creation paradigm based on value correspondences that show how a value of a target attribute can be created from a sete of values of source attributes. We describe the use of the value correspondence framework in Clio, a prototype tool for semi-automated schema mapping, and present an algorithm for query derivation from an evolving set of value correspondences.

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  • ISBN: 1558607153
  • SCOPUS: 2-s2.0-0003229927
  • PUI: 368877276
  • SGR: 0003229927

Authors

  • Renée J Miller

  • Laura M Haas

  • Mauricio a Hernández

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