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- Join_dependency abstract "In dependency theory, a join dependency is a constraint on the set of legal relations over a database scheme. A table T is subject to a join dependency if T can always be recreated by joining multiple tables each having a subset of the attributes of T. If one of the tables in the join has all the attributes of the table T, the join dependency is called trivial.The join dependency plays an important role in the Fifth normal form, also known as project-join normal form, because it can be proven that if you decompose a scheme in tables to , the decomposition will be a lossless-join decomposition if you restrict the legal relations on to a join dependency on called .Another way to describe a join dependency is to say that the set of relationships in the join dependency is independent of each other.Unlike in the case of functional dependencies, there is no sound and complete axiomatization for join dependencies, though axiomatization exist for more expressive dependency languages such as full typed dependencies. However, implication of join dependencies is decidable.".
- Join_dependency wikiPageID "23539390".
- Join_dependency wikiPageRevisionID "586955929".
- Join_dependency hasPhotoCollection Join_dependency.
- Join_dependency subject Category:Database_normalization.
- Join_dependency comment "In dependency theory, a join dependency is a constraint on the set of legal relations over a database scheme. A table T is subject to a join dependency if T can always be recreated by joining multiple tables each having a subset of the attributes of T.".
- Join_dependency label "Join dependency".
- Join_dependency sameAs m.06w80qq.
- Join_dependency sameAs Q12105580.
- Join_dependency sameAs Q12105580.
- Join_dependency wasDerivedFrom Join_dependency?oldid=586955929.
- Join_dependency isPrimaryTopicOf Join_dependency.