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Topic: 4NF

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	Relational Model: Advanced Normalization
		They further argue that the benefits gained from transforming entities into 4NF and 5NF are so slight that it is not worth the effort.
		To transform a table with multivalued dependencies into the 4NF move each MVD pair to a new table.
		Most experts agree that tables that are in the 4NF are also in 5NF except for "pathological" cases.
	www.utexas.edu /its/windows/database/datamodeling/rm/rm8.html (720 words)

	Multivalued Normalisation - Fourth Normal Form (Site not responding. Last check: 2007-10-31)
		The decomposed relations are in fourth normal form (4NF) which we shall now define.
		Intuitively R is in 4NF if all dependencies are a result of keys.
		The decomposition of a relation to achieve 4NF would normally result in not only reduction of redundancies but also avoidance of anomalies.
	www.cs.jcu.edu.au /ftp/web/teaching/Subjects/cp3020/1997/Lecture_Notes/normalisation/4nf.html (201 words)

	Department of Computer Science (Site not responding. Last check: 2007-10-31)
		In this case course does not multidetermine student, and STC is in 4NF.
		Suppose you have decided it is in 4NF, it represents one complex multivalued fact -- which supplier supplies which parts to which projects.
		An informal summary of 5NF is 'if even after 4NF you can still find a lossless way of splitting an all key relation, then you should do it'.
	homepages.feis.herts.ac.uk /~msc_db/w6.html (1628 words)

	[No title]
		The cure: 4NF A relation is in 4NF if for every nontrivial mvd x->>y, x is a superkey (any combination of attributes that is a unique ID in the relation (non-minimal) for the relation.
		As usual, the way to get a relation into 4NF is to decompose it, to get the mvds into separate relations: (manager, phone#) (manager, employee) which are now trivial mvds, making up the entire table.
		SOLUTION: Lossless 4NF decomposition: Movie((Producer violates 4NF (you could choose the other multivariable dependency also): D={Movie((Producer,Movie((Star}, CK={Movie, Producer, Star} It is not in 4NF, since in D none of the left hand sides is a superkey.
	cse.unl.edu /~agnes/multi_own_0.doc (1312 words)

	ADM Activity: A3.13.3 Check entity relationship diagram correctness (Site not responding. Last check: 2007-10-31)
		If it proves difficult to reach 4NF directly, apply the four normalization steps to the attribute types.
		This is 4NF and is the equivalent of decomposing into subtypes.
		Examine the resulting 4NF relations and decide whether to introduce new entity types, new subtypes, or new relationship types and whether to move any attribute types to other entity types.
	sysdev.ucdavis.edu /webadm/activities/a3-/a3-13-3/a3-13-3.htm (1246 words)

	4NF, nonsence for those that normalise well till third normal form
		The second example, at www.cs.jcu.edu.au/.../node12.html, describes 4NF as a solution for dependencies between key elements.
		Apply the first normal form correctly and you won't need 4NF anymore.
		For a given student number and course number the orther data elements have only one possible value.
	www.sum-it.nl /en200238.html (237 words)

	MultiValue Databases - Post-relational / 4NF databases
		It would seem that there isn't total agreement as to how exactly the MultiValue database model fits into the generally accepted nomenclature and mathematical definitions of the various "Normal Forms" of databases.
		Other terms that are sometimes used in connection with it are "post-relational", "nested-relational", "multidimensional", "object-relational", and "4NF (fourth normal form)".
		The first three seem to be marketing rather than strictly mathematical terms and so, until such time as this issue is resolved, any of these terms might be used throughout this site as alternative terminology for the MultiValue Database, and any corrections regarding this will be gratefully accepted.
	www.multivaluedatabases.com /mvprdb.htm (201 words)

	CSI3310-15 (Site not responding. Last check: 2007-10-31)
		A relation schema R is in 4NF with respect to a set F
		A relation schema R is in 4NF with respect to a set
		Choose a relation schema Q in D that is not in 4NF
	clem.mscd.edu /~tuckerp/CSI3310/C15.2.html (1160 words)

	4NF Data Redundancy Problem - dBforums
		If you would prefer not to see any double-underlined words and corresponding advertisements, please click here.
		At the point that 4NF is achieved, the url_relations table holds unique relationships between users and their URLs.
		If your schema works for you (and your use of the term 4NF makes me think that it will), the databse engine should happily chew through it with gusto!
	www.dbforums.com /t990969.html (446 words)

	Normalization
		The first of these steps is called First Normal Form (1NF) and as the steps progress subsequent levels of normalization are aptly called Second Normal Form (2NF), Third Normal Form (3NF), Fourth Normal Form (4NF), and lastly Fifth Normal Form (5NF).
		You as well as most Database Developers will never have to anguish through the 4NF nor the 5NF steps of Normalization.
		A relation is in 4NF if it has no multi-valued dependencies.
	www.joegakenheimer.com /sql/normalization.htm (655 words)

	Normalization 4NF : MAC-NET (Site not responding. Last check: 2007-10-31)
		As an example of the anomalies that can occur, realize that it is not possible to add a new class taught by some teacher without adding at least one student who is enrolled in this class.
		To achieve 4NF, represent each independent many-to-many relationship through its own cross-reference table.
		Consider an example with two many-to-many relationships, between students and classes and between classes and teachers.
	www.mac-net.com /938485.page (165 words)

	Coding Domino server tasks in C: the adventure continues (EasyPrint)
		I'd welcome any comments by email at ian@4nf.co.uk, or if you're one of the lucky ones with a ticket, why not drop by 4NF at Lotusphere in Orlando (stand D219) to say hi, listen to our British accents, and enter for a chance to win some very sexy PC speakers.
		ACLHelp, some other free programs, and some commercial software evaluation kits are all available on the 4NF Web site at http://www.4nf.co.uk.
		Ian Cherrill is a Product Manager at 4NF Information Technology Ltd. He can be reached at ian@4nf.co.uk.
	www.dominopower.com /issuesprint/issue200101/coding0101.html (1989 words)

	Chapter 5 (Site not responding. Last check: 2007-10-31)
		No row can contain two or more __________ facts about an entity.
		A table is in 4NF if it is in 3NF and has not multiple sets of
		Which of the following is NOT a requirement that a table row's attributes must conform to in 3NF?
	www.westol.com /martzr/cpt_235/chap_5.htm (1729 words)

	[No title]
		y1 ->> z3 ------------------- 4NF: A relation R is in 4NF if for every MVD X ->> Y then all attributes of R other than Y are also functionally dependent on X i.e., only one MVD in the relation CTX and EMP are not in 4NF.
		CT, CX are EAD, EP are Can we further decompose 4NF relations?
		Join Dependencies and 5NF We can decompose a relation into two nonlossly (We can join them back to the original relation) there are relations that cannot be nonloss-decomposed into two but can be decomposed into three or more A relation is n-decomposable if it can be nonloss-decomposed into n relations (projections) but not into m
	www.scs.carleton.ca /~mengchi/3005/day.19 (468 words)

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