Abstract
We consider conditions that have appeared in the literature with the purpose of defining a “good” decomposition of a relation scheme. We show that these notions are equivalent in the case that all constraints in the database are functional dependencies. This result solves an open problem of Rissanen. However, for arbitrary constraints the notions are shown to differ.
From Journal of Computer and System Sciences, Volume 21, Number 2, October 1980; copyright Academic Press, Inc.; reprinted with permission.
Work partially supported by NSF grant MCS-76–15255. D. Maier and A. O. Mendelzon were also supported by IBM fellowships while at Princeton University, and F. Sadri by a scholarship from Isfahan University of Technology.
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© 1981 Plenum Press, New York
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Maier, D., Mendelzon, A.O., Sadri, F., Ullman, J.D. (1981). Adequacy of Decompositions of Relational Databases. In: Gallaire, H., Minker, J., Nicolas, J.M. (eds) Advances in Data Base Theory. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-8297-7_4
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DOI: https://doi.org/10.1007/978-1-4615-8297-7_4
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