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- W770695487 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 such critical data interoperability tasks as data exchange and data integration. For this reason, they have been the focus of extensive research investigations over the past several years. Since in real-life applications schema mappings can be quite complex, it is important to develop methods and tools for illustrating, explaining, and deriving schema mappings. A promising approach to this eect is to use “good” data examples that illustrate 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. We show that every LAV schema mapping (i.e., a schema mapping specified by a finite set of local-as-view tuple-generating dependencies) is uniquely characterized by a finite set of universal data examples with respect to the class of all LAV schema mappings. We also show that this type of result does not hold for arbitrary GAV schema mappings (i.e., schema mappings specified by a finite set of global-as-view tuplegenerating dependencies). After this, we give a necessary and sucient" @default.
- W770695487 created "2016-06-24" @default.
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- W770695487 date "2011-01-01" @default.
- W770695487 modified "2023-09-27" @default.
- W770695487 title "Schema Mappings and Data Examples: Deriving Syntax from Semantics" @default.
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