DEPENDENCIESDEPENDENCIES HaDoHaDo FunctionalDependencyFunctionalDependency b c 4 Q $ Domain(X) Range(Y) a FunctionalDependencyFunctionalDependency RecallthatifXuniquelydeterminesY,thenYisRecallthatifXuniquelydeterminesY,thenYis functionallydependentonX.functionallydependentonX. ...
... 潜像 latent image 潜在多值相关 multivalued dependencies 潜在根 latent root ... www.docstoc.com|基于1 个网页 2. 多值功能支配关系 於第三正规化型式(3NF),当关联表呈现多值功能支配关系(Multivalued Dependencies)www.docstoc.com|基于1 个网页 3. 支配关系 支配关系(Multivalued Dependencies)时,...
多值依赖是将“multivalued dependency"翻译成 中文。 译文示例:Also note that the table is in 4NF, since there are no multivalued dependencies (2-part join dependencies) in the table: no column (which by itself is not a candidate key or a superkey) is a determinant for the other two co...
Based on the proposed similarity measure, the paper focuses on the issues of vague multivalued functional dependencies(VMVDs), and then proposes a set of sound inference rules, which are similar to Armstrong's axioms for classical cases, for vague multivalued dependencies....
Key Points Multivalued dependencies, like functional dependencies, can cause redundancy in relational databases. For instance, in the following table, each director of the movie The Matrix is recorded once pe ...doi:10.1007/978-0-387-39940-9_1248Solmaz Kolahi...
These lecture slide are very easy to understand and very helpful to built a concept about the foundation of computers and Database Design.The key points in these slide are:Multivalued Dependencies, Functional Dependency, Domain and Range, Set of Possible Values, Full Constraint, Sets of Attributes...
Multivalued dependencies and a new normal form for relational databases A new type of dependency, which includes the well-known functional dependencies as a special case, is defined for relational databases. By using this conce... Ronald,Fagin - 《Acm Transactions on Database Systems》 被引量:...
This set of Database Multiple Choice Questions & Answers (MCQs) focuses on “Using Multivalued Dependencies”. 1. The normal form which satisfies multivalued dependencies and which is in BCNF is a) 4 NF b) 3 NF c) 2 NF d) All of the mentioned ...
The problem of inference rules formultivalued dependencyis the key to solve implication problem between dependencies in XML and the key problem of XML normalization theory. XML多值依赖的推理规则集问题是解决XML数据依赖的蕴涵问题的基础,是XML规范化理论的关键问题之一。
The fuzzy database has integrity limitations including data dependencies. In this paper,first fuzzy multivalued dependency based semantic proximity and its problems are studied. To solve theseproblems, the semantic proximity's formula is modified, and fuzzy multivalued dependency based on theconcept of...