PUMA
Istituto di Scienza e Tecnologie dell'Informazione     
Bertino E., Musto D. Query simplification by using knowledge about data semantics. Internal note IEI-B4-65, 1986.
 
 
Abstract
(English)
In this paper the problem of query trasformation semantic properties of data is addressed. In particular a trasformation rules is defined, and then theorems stating correctness of the rules are given. The theorems ensure that the query obtained by applying the trasformations to a given query is equivalent to the original one, that is the two queries define the same set of tuples. Since join elimination clustering index introduction, empty query test are allowed by such trasformations, they become useful in the process of query optimization.
Subject relation scheme
relational algebra
query optimization
semantic data project


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