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• W1989109404 abstract "In this paper, we give an overview of the most representative approaches aimed at querying databases containing ill-known data, starting from the pioneering works by Codd and Lipski and up to very recent proposals. This study focuses on approaches with a clear and sound semantics, based on the notion of possible worlds. Three types of queries are considered: (i) those about attribute values (in an algebraic or SQL-like framework), (ii) those about the properties satisfied by a given set of worlds (i.e., a set of instances of an imprecise database), and (iii) those about the representation of uncertain data. For the first two types, it is emphasized that a trade-off has to be found between expressivity (of the model) and tractability (of the queries in the context of a given model)." @default.
• W1989109404 created "2016-06-24" @default.
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• W1989109404 date "2010-10-01" @default.
• W1989109404 modified "2023-10-17" @default.
• W1989109404 title "MODELING AND QUERYING UNCERTAIN RELATIONAL DATABASES: A SURVEY OF APPROACHES BASED ON THE POSSIBLE WORLDS SEMANTICS" @default.
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• W1989109404 doi "https://doi.org/10.1142/s0218488510006702" @default.
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