By Keng Siau
Complex issues in Database examine positive aspects the most recent, state of the art study findings facing all elements of database administration, platforms research and layout and software program engineering. This e-book offers details that's instrumental within the development and improvement of conception and perform relating to details know-how and administration of knowledge assets.
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Extra info for Advanced Topics in Database Research, Vol. 1
The following sections then, extend these arguments to include other issues paramount to the determination of full equivalence between ternary relationships and binary equivalents in both theoretical and practical environments. Functional Dependency Preserving Decompositions When we consider the decomposition of a ternary relationship into a binary relationship equivalent, we are actually considering whether the equivalent model has the ability to represent and enforce all constraints that were present in the original structure.
This means, fundamentally, that any unconstrained ternary relationship can not have an equivalent, binary decomposition structure (and also why unconstrained ternary relationships are not included in the analysis of decompositional equivalents in the remainder of the paper). Table 1: 1:1:1 cardinality with all M:N binary relationships M N X 1 1 M Z Y N 1 N X1 : Y1 : Z1 X2 : Y2 : Z2 X1 : Y2 : Z3 X4 : Y4 : Z3 M Table 1. 1:1:1 cardinality with all M:N binary relationships Ternary Relationships: Semantic Requirements and Logically Correct Alternatives 23 Restriction of Binary Relationship Imposition Further exploring the implicit, fundamental dynamics of ternary relationships, Jones and Song (1996) demonstrate that binary constraint imposition on ternary relationships can take place only under certain situations.
McKee, R. L. and Rodgers, J. (1992). N-ary versus binary data modeling: A matter of perspective. Data Resource Management, 3(4), Fall, 22-32. Song, I. , Jones, T. H. and Park, E. K. (1993). Binary relationship imposition rules on ternary relationships in ER modeling. C. Song, I. , Evans, M. and Park, E. K. (1995). A comparative analysis of entity-relationship diagrams. Journal of Computer & Software Engineering, 3(4), 427-459. Song, I. , Medsker, C. and Ewen, E. (2001). An analysis of many-to-many relationships between fact and dimension tables in dimensional modeling.
Advanced Topics in Database Research, Vol. 1 by Keng Siau