Database normalization - Wikipedia, the free encyclopedia
|
|
In the field of relational database design, normalization is a systematic way of ensuring that a database structure is suitable for general-purpose querying and free of certain undesirable character...
en.wikipedia.org/wiki/Database_normalization
|
|
|
What is Boyce-Codd Normal Form (BCNF)? Find out here! ... Definition: A relation is in Boyce-Codd Normal Form (BCNF) if every determinant is a candidate key. (See the links in the box at right for definitions of determinant and candidate key.)
|
databases.about.com/cs/specificproducts/g/bcnf.htm
|
|
|
|
Higher Normal Forms - Boyce-Codd Normal Form: ... Boyce-Codd normal form (BCNF) can be thought of as a "new" third normal form. It was introduced to cover situations that the "old" third normal form did not address. Keep in mind the mean of a determinant (determines the value in another field) and candidate keys (qualify...
|
www.databasedev.co.uk/higher_norm_form.html
www.databasedev.co.uk/higher_norm_form.html
|
|
|
The Boyce-Codd normal form (abbreviated BCNF) is a "key heavy" derivation of the third normal form. The simplest way I can think to define it is if the key uniquely identifies a row, but the key includes more columns than are actually required to uniquely identify a row, then a table is in BCNF. For example:
|
searchoracle.techtarget.com/expert/KnowledgebaseAnswer/...
searchoracle.techtarget.com/expert/KnowledgebaseAnswer/0,289625,sid41_gci1073455,00.html
|
|
|
To check if a nontrivial dependency causes a violation of BCNF, compute a+(attribute closure of ), and verify that it includes all attributes of R; ...
|
www.cs.sjsu.edu/faculty/lee/cs157/Thanh_Truong___Boyce_...
www.cs.sjsu.edu/faculty/lee/cs157/Thanh_Truong___Boyce_Codd_Normal_Form.ppt
|
|
|
BCNF. A relation schema R is in BCNF if for every set of attributes ... Clearly, S is not in BCNF, since L K and L is not a superkey. However, every BCNF ...
|
www.cs.virginia.edu/~son/662.pdffiles/662.bcnf.pdf
|
|
A relation schema R is in Boyce-Codd Normal Form (BCNF) with respect to a set F of functional dependencies if for all functional dependencies in of the form , where and , at least one of the following holds:
|
www.cs.sfu.ca/CC/354/zaiane/material/notes/Chapter7/nod...
www.cs.sfu.ca/CC/354/zaiane/material/notes/Chapter7/node10.html
|
|
R is in BCNF, if the only non-trivial FDs that hold over R are key constraints ... A relation R is BCNF, iff every determinant is a candidate key for R ... Back to first slide...
|
www.cs.uh.edu/~marek/notes/lecture12/tsld007.htm
|
|
Also, it is known [1] that a relation is in BCNF, if its horn function ... The algorithm for the decomposition of a relation into BCNF can be stated as ...
|
www.e-atheneum.net/science/BCNF.pdf
|
|
