NDLI: A normal form for preventing redundant tuples in relational databases

Content Provider	ACM Digital Library
Author	Darwen, Hugh Fagin, Ronald Date, C. J.
Abstract	We introduce a new normal form, called essential tuple normal form (ETNF), for relations in a relational database where the constraints are given by functional dependencies and join dependencies. ETNF lies strictly between fourth normal form and fifth normal form (5NF, also known as projection-join normal form). We show that ETNF, although strictly weaker than 5NF, is exactly as effective as 5NF in eliminating redundancy of tuples. Our definition of ETNF is semantic, in that it is defined in terms of tuple redundancy. We give a syntactic characterization of ETNF, which says that a relation schema is in ETNF if and only if it is in Boyce-Codd normal form and some component of every explicitly declared join dependency of the schema is a superkey.
Starting Page	114
Ending Page	126
Page Count	13
File Format	PDF
ISBN	9781450307918
DOI	10.1145/2274576.2274589
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2012-03-26
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Database design Redundancy Bcnf Fifth normal form Relational database Essential tuple normal form Fourth normal form
Content Type	Text
Resource Type	Article

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A normal form for preventing redundant tuples in relational databases