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Mar 31, 2012 · One way to express the 3NF is: All attributes should depend on the key, whole key and nothing but the key. The transitive dependency X->Y->Z violates that principle, leading to data redundancy and potential modification anomalies. Let us break this down: By definition, for a functional dependency X->Y->Z to also be transitive, the X<-Y must not ...
Apr 22, 2013 · 1) Full dependencies are when the full key is required (all columns of the key) to determine another attribute. 2) Partial dependencies are when the key is composite and some but not all of the columns of the key determine another attribute. (This may still be more than one column.) 3) Transitive dependencies are as you said. answered Apr 22 ...
Oct 23, 2015 · 9. Transitive dependency is expressing the dependency of A on C when A depends on B and B depends on C. A functional dependency is an association between two attributes of the same relational database table. One of the attributes is called the determinant and the other attribute is called the determined. For each value of the determinant there ...
Jan 3, 2021 · Partial dependence is solved for arriving to a relation in 2NF but 2NF is a "stepping stone" (C. Date) for solving any transitive dependency and arriving to a relation in 3NF (which is the operational target). However, the most interested thing on partial dependence is that it is a particular case of the own transitive dependency.
Oct 6, 2013 · The term "transitive" just means the dependency has more than one part to it. Note that a relation may satisfy 3NF while still having transitive dependencies. In this case however, to satisfy 3NF you need to decompose A,B,C into at least two relations with A,B and C all being candidate keys.
Oct 19, 2017 · Transitive dependency occurs only if you have indirect relationship between more than 2 attributes that are not part of they key. In your example, as you explained, the StaffID is part of your dependency, which is fine because it's the primary key. Also you can look at this question that shows what is wrong with a transitive dependency. It ...
Jul 16, 2023 · Codd's definition in his paper "Further normalization of the data base relational model" can be stated as follows: For three distinct collections A, B, C of attributes, we say a transitive dependence A -> B -> C holds if the following hold: The functional dependencies A -> B and B -> C hold. The functional dependency B -> A does not hold.
Jul 17, 2013 · In my project I have Job table that holds information for job posting. Every job can be targeted to (this info is stored in JobLocations): only one country, be country wide, eg: (id = 1, idCountry...
May 15, 2020 · It has not removed the Transitive Functional Dependency at all. Normalisation would (assuming there is a FD from Full Name to Salutation): Put Full Name and Salutation in a separate table, keyed by Full Name -- that represents one of the FDs. Remove Salutation from the Membership table. Not introduce a Salutation ID field.
Mar 10, 2021 · Variant C -> Variant B -> Variant A. They are transitive functional dependent by the sequence C > B > A. (-> means depends on) In short, I am seeking a way to maintain these variants. What I am trying to achieve is to design a schema to maintain the variants, and make it possible for easy future sustainable management on the variants.
