Istituto di Scienza e Tecnologie dell'Informazione     
Bertino E., Musto D. Semantic query transformation. In: INFORSID'1986 - Congrès INFORSID 1986. (Fontevrault, France, 27 May 1986). Atti, pp. 141 - 171. J. Luguet (ed.). 1986.
In this paper the problem of query transformation by using semantic properties of data is addressed. First a formal definition of semantic properties is given in framework of relational algebra and the concept of minimal properties is presented. Then two theorems stating the correctness for a class of query transformations are presented. The theorems ensure that the query obtained by applying the transformations to a given query is semantically equivalent to original query.
Subject Query optimization

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