Schema Mappings and Data Examples: An Interplay between Syntax and Semantics.
Phokion Kolaitis (UC Santa Cruz and IBM Almaden)
Info
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Date |
24th April 2012 (week 1, Trinity Term 2012) |
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Time |
11:30 |
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Place |
147 |
Abstract
Schema mappings are high-level specifications that describe the relationship between two database schemas. Schema
mappings are considered to be the essential building blocks in critical data interoperability tasks, including data exchange
and data integration. For this reason, schema mappings have been the focus of an extensive research investigation over the
past several years. Since in real-life applications schema mappings can be quite complex, it is imperative to develop methods
and tools for illustrating, explaining, and deriving schema mappings. A promising approach to this effect is to use ``good''
data examples that illustrate or capture the schema mapping at hand.
In this talk, we present an overview
of recent work on characterizing and deriving schema mappings via a finite set of data examples with emphasis on GAV schema
mappings, that is, schema mappings specified by a finite set of global-as-view constraints. Along the way, we establish
tight connections between unique characterizability of schema mappings and homomorphism dualities. This is joint work with
Bogdan Alexe (IBM Research - Almaden), Balder ten Cate (UC Santa Cruz), and Wang-Chiew Tan (UC Santa Cruz and IBM Research
- Almaden).
Further info
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