Abstract
This paper presents formal mappings between semantic, nested relational, and relational database schemes and instances. It is shown that the corresponding schemes are equivalent w.r.t. the notion of information capacity [Hul 86], i.e., the mappings between the corresponding sets of instances are bijections. The examinations are done in the framework of the database model EXTREM (EXTended RElational Model) which integrates four types of database models: semantic (the IFO model [AbH
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© 1989 Springer-Verlag Berlin Heidelberg
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Heuer, A. (1989). Equivalent schemes in semantic, nested relational, and relational database models. In: Demetrovics, J., Thalheim, B. (eds) MFDBS 89. MFDBS 1989. Lecture Notes in Computer Science, vol 364. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-51251-9_16
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DOI: https://doi.org/10.1007/3-540-51251-9_16
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