Istituto di Scienza e Tecnologie dell'Informazione     
Beltrame R. An Extension of relational Database Model to probabilistic Data. An approach based on generalized arrays. Internal note CNUCE-B4-83-024, 1983.
In many application, for example ion representing data concerning historical "objects", alternatives are the rule; so we are led to probabilistic scheme in their representation. A deterministic approach, which underlies actual DBMS types, leads to very poor results, and, in certain cases, to misleading ones too. An extension of relational model is proposed to take into account these aspects, and the effects of a non-deterministic approach on operationd concerning both relations and database are examined. Aformal description representation of data. The effects on the queries are outlined. A representation as a general array is discussed which preserves the typical properties of the relational mode with deterministic data, and the form of the operations
Subject Database

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