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On the number of candidate keys. (English) Zbl 0394.68015


MSC:

68P05 Data structures
68P20 Information storage and retrieval of data
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References:

[1] Codd, E.F., A relational model of data for large shared data banks, Comm. ACM, 13, 377-387, (1970) · Zbl 0207.18003
[2] Codd, E.F., Normalized data base structure: A brief tutorial, Proc. ACM-SIGFIDET workshop on data description, access and control, (1971)
[3] Codd, E.F., Further normalization of the data base relational model, (), 33-64
[4] Delobel, C.; Casey, R.G., Decomposition of a data base and the theory of Boolean switching functions, IBM J. res. develop., 17, 374-386, (1973) · Zbl 0259.68016
[5] Fadous, R.; Forsyth, J., Finding candidate keys for relational data bases, Proc. ACM SIGMOD, 203-210, (1975)
[6] Yu, C.T.; Johnson, D.T., On the complexity of finding the set of candidate keys for a given set of functional dependencies, Information processing lett., 5, 4, 100-101, (1976) · Zbl 0336.68018
[7] Sperner, E., Eine satz uber untermengen einer endlichen menge, Math. Z., 27, 544-548, (1928) · JFM 54.0090.06
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