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Normalization Of Database Tables Pdf Download

 
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MessagePosté le: Sam 3 Sep - 07:43 (2016)    Sujet du message: Normalization Of Database Tables Pdf Download Répondre en citant




Normalization Of Database Tables Pdf Download > bit.ly/2bRT9o8

























































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Insertion Anamoly : Suppose for a new admission, we have a Student id(Sid), name and address of a student but if student has not opted for any subjects yet then we have to insert NULL there, leading to Insertion Anamoly. To understand these anomalies let us take an example of Student table. If any column depends only on one part of the concatenated key, then the table fails Second normal form. The dependency between zip and other fields is called transitive dependency. Normalization Rule Normalization rule are divided into following normal form.

To achieve second normal form, it would be helpful to split out the subjects into an independent table, and match them up using the student names as foreign keys. Second Normal Form (2NF) As per the Second Normal Form there must not be any partial dependency of any column on primary key. Normalization is a systematic approach of decomposing tables to eliminate data redundancy and undesirable characteristics like Insertion, Update and Deletion Anamolies. " . New Student Table following 2NF will be : StudentAge Adam15 Alex14 Stuart17 In Student Table the candidate key will be Student column, because all other column i.e Age is dependent on it. Now, both the above tables qualifies for Second Normal Form and will never suffer from Update Anomalies. Also in the above Table in First Normal Form, while the candidate key is {Student, Subject}, Age of Student only depends on Student column, which is incorrect as per Second Normal Form.

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