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Database-Management-Systems---10CS54-VTU-notes-->View question


Asked On2018-09-06 03:06:44 by:anonymousguy7799

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Normalization is a process for evaluating and correcting table structures to minimize data redundancies, thereby reducing the likelihood of data anomalies. The normalization process involves assigning attributes to tables based on the concept of determination.

Normalization works through a series of stages called normal forms. The first three stages are described as first normal form (1NF), second normal form (2NF), and third normal form (3NF). From a structural point of view, 2NF is better than 1NF, and 3NF is better than 2NF. For most purposes in business database design, 3NF is as high as you need to go in the normalization process. Properly designed 3NF structures also meet the requirements of 4th normal form (4NF).


Answerd on:2022-08-17 Answerd By:sanjanamandhare

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Second Normal Form (2NF) 
Second normal form is based on the concept of fully functional dependency. A functional X Y is a fully functional dependency is removal of any attribute A from X means that the dependency does not hold any more.
 A relation schema is in 2NF if every nonprime attribute in relation is fully functionally dependent on the primary key of the relation. It also can be restated as: a relation schema is in 2NF if every nonprime attribute in relation is not partially dependent on any key of the relation. Practical Rule: "Eliminate Redundant Data," i.e., if an attribute depends on only part of a multivalued key, remove it to a separate table. 
Formal Definition: A relation is in second normal form (2NF) if and only if it is in 1NF and every nonkey attribute is fully dependent on the primary key. 

Answerd on:2018-09-06 Answerd By:Nikhil-bharadwaj

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