Encyclopedia of Database Systems

2018 Edition
| Editors: Ling Liu, M. Tamer Özsu

Schema Mapping Composition

  • Wang-Chiew Tan
Reference work entry
DOI: https://doi.org/10.1007/978-1-4614-8265-9_1467

Synonyms

Mapping composition; Semantic mapping composition

Definition

A schema mapping (or mapping) is a triple = ( S 1, S 2, Σ), where S 1 and S 2 are relational schemas with no relation symbols in common and Σ is a set of formulas of some logical formalism over ( S 1, S 2). An instance of is a pair ( I, J) where I is an instance of S 1 and J is an instance of S 2 such that ( I, J) satisfies every formula in the set Σ. The set of all instances of is denoted as Inst .
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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.University of California-Santa CruzSanta CruzUSA

Section editors and affiliations

  • Renée J. Miller
    • 1
  1. 1.Dept. of Computer ScienceUniversity of Toronto, Department of Computer ScienceTorontoCanada