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Recommended Reading
Grahne G. The Problem of Incomplete Information in Relational Databases. LNCS 554, Springer-Verlag, Secaucus, NJ, USA, 1991.
Levene M. and Loizou G. A Guided Tour of Relational Databases and Beyond, Chap. 5. Springer, London, UK, 1999.
Van der Meyden, R. Logical approaches to incomplete information: a survey. In Logics for Databases and Information Systems, J. Chomicki, G. Saake (eds.). Kluwer, Boston, MA, USA, 1998, pp. 307–356.
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Bertossi, L. (2009). Null Values. In: LIU, L., ÖZSU, M.T. (eds) Encyclopedia of Database Systems. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-39940-9_1267
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DOI: https://doi.org/10.1007/978-0-387-39940-9_1267
Publisher Name: Springer, Boston, MA
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