A Simple Guide to Five Normal Forms in Relational Database Theory
William Kent, "A Simple Guide to Five Normal Forms in Relational Database Theory", Communications of the ACM 26(2), Feb. 1983, 120-125. Also IBM Technical Report TR03.159, Aug. 1981. Also presented at SHARE 62, March 1984, Anaheim, California. Also in A.R> 1 INTRODUCTION . . . 2 > 2 FIRST NORMAL FORM . . . 2 > 3 SECOND AND THIRD NORMAL FORMS . . . 2 >> 3.1 Second Normal Form . . . 2 >> 3.2 Third Normal Form . . . 3 >> 3.3 Functional Dependencies . . . 4 > 4 FOURTH AND FIFTH NORMAL FORMS . . . 5 >> 4.1 Fourth Normal Form . . . 6 >>> 4.1.1 Independence . . . 8 >>> 4.1.2 Multivalued Dependencies . . . 9 >> 4.2 Fifth Normal Form . . . 9 > 5 UNAVOIDABLE REDUNDANCIES . . . 12 > 6 INTER-RECORD REDUNDANCY . . . 13 > 7 CONCLUSION . . . 13 > 8 ACKNOWLEDGMENT . . . 14 > 9 REFERENCES . . . 14
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