However, some of those methods suffer from the high time complexity, and some of them cannot obtain the acceptable results. In this paper, we borrow the idea from the database theory, and propose the concepts of functional dependency (FD) between nodes and node closure first, then we ...
Step 3:Otherwise we have to find at least one value of "A" on which are having different values of "B" than the functional dependency is invalid. Attribute Closure The set "A*" is said to be the closure set of "A" if the set of attributes are functionally dependent on the attributes...
transitive closure传递闭包 transitive verb及物动词 acute angle-closure glaucoma急性闭角型青光眼 closure of a set集的闭包 complex transitive verb复合及物动词 error of closure闭合(误)差 neural tube closure神经管闭合 steam flow closure蒸汽喷射排气封罐机 transitive functional dependency传递函数依赖热门...
By analyzing the standard theory of relational database and making use of the knowledge of the functional dependency and diagram,this article mainly discusses how to evaluate candidate keys to relational Database by using attribute closures and functional dependency diagrams. 通过对关系数据库规范化理论...
The notion of computability closure has been introduced for proving the termination of higher-order rewriting with first-order matching by Jean-Pierre Jouannaud and Mitsuhiro Okada in a 1997 draft which later served as a basis for the author’s PhD. In t
9. The method of claim 7, wherein extracting further comprises: forming one or more functional relationships between the dimensional differences and the delta-parameters; and generating the delta-parameters directly from the dimensional differences using the functional relationships. 10. The method of...
Three typical types of dependencies are often involved in the discovery, functional dependencies (FDs), Inclusion dependencies (INDs) and Conditional Functional Dependency (CFD). FDs represent value consistencies between two sets of attributes while INDs represent value reference rel...
functional dependencylower bounded lattice/ C6130 Data handling techniques C6160D Relational databasesClosure systems (i.e. families of subsets of a set S containing S and closed by set intersection) or, equivalently, closure operators and full implicational systems appear in many fields in pure ...
International Journal of Intelligent Systems 9, 421–439 (1994)G. Chen, E. Kerre and Vandenbulcke J, “A computational algorithm for the FFD transitive closure and a complete axiomatization of fuzzy functional dependency,” Journal of Intelligent Systems , 9 , 421–440, 1994....
By analyzing the standard theory of relational database and making use of the knowledge of the functional dependency and diagram,this article mainly discusses how to evaluate candidate keys to relational Database by usingattribute closuresand functional dependency diagrams. ...