What is the need for normalizationDatabase Management Systems 10CS54 VTU notes JUNJULY 2013Jan 2016

The Eduladder is a community of students, teachers, and programmers just interested to make you pass any exams. So we solve previous year question papers for you.
In eduladder you can Ask,Answer,Listen,Earn and Download Questions and Question papers.
Watch related videos of your favorite subject.
Connect with students from different parts of the world.
Apply or Post Jobs, Courses ,Internships and Volunteering opportunity. For FREE
See Our team
Wondering how we keep quality?
Got unsolved questions? Ask Questions

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


Asked On2018-09-06 01:54:00 by:anonymousguy7799

Taged users:


Likes:
Be first to like this question

Dislikes:
Be first to dislike this question
Talk about this  Delete  Like  Dislike
View all qusetions

You might like this video:How eduladder works
Watch more here

Watch more videos from this user Here

Eduladder videos are community generated video contents which we deliver to you according to the content you are browsing.We are constantly working on video delivering algorithms in order to give you the best experiance as possible

Learn how to upload a video over here

Answers
The purpose of normalization.
 • The problems associated with redundant data.
 • The identification of various types of update anomalies such as insertion, deletion, and modification anomalies. 
• How to recognize the appropriateness or quality of the design of relations. 
• The concept of functional dependency, the main tool for measuring the appropriateness of attribute groupings in relations. 
• How functional dependencies can be used to group attributes into relations that are in a known normal form.
 • How to define normal forms for relations.  • How to undertake the process of normalization. • How to identify the most commonly used normal forms, namely first (1NF), second (2NF), and third (3NF) normal forms, and Boyce-Codd normal form (BCNF). • How to identify fourth (4NF), and fifth (5NF) normal forms. 
First Normal Form (1NF)
First normal form is now considered to be part of the formal definition of a relation; historically, it was defined to disallow multivalued attributes, composite attributes, and their combinations. It states that the domains of attributes must include only atomic (simple, indivisible) values and that the value of any attribute in a tuple must be a single value from the domain of that attribute. Practical Rule: "Eliminate Repeating Groups," i.e., make a separate table for each set of related attributes, and give each table a primary key. Formal Definition: A relation is in first normal form (1NF) if and only if all underlying simple domains contain atomic values only.
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.
Third Normal Form (3NF) Third normal form is based on the concept of transitive dependency. A functional dependency X Y in a relation is a transitive dependency if there is a set of attributes Z that is not a subset of any key of the relation, and both X Z and Z Y hold. In other words, a relation is in 3NF if, whenever a functional dependency



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

Likes:
Be first to like this answer

Dislikes:
Be first to dislike this answer
Talk about this  Delete  Like  Dislike

You might like this video:Normal Curves
Watch more here

Watch more videos from this user Here

Eduladder videos are community generated video contents which we deliver to you according to the content you are browsing.We are constantly working on video delivering algorithms in order to give you the best experiance as possible

Learn how to upload a video and start earning here



Lets together make the web is a better place

We made eduladder by keeping the ideology of building a supermarket of all the educational material available under one roof. We are doing it with the help of individual contributors like you, interns and employees. So the resources you are looking for can be easily available and accessible also with the freedom of remix reuse and reshare our content under the terms of creative commons license with attribution required close.

You can also contribute to our vision of "Helping student to pass any exams" with these.
Answer a question: You can answer the questions not yet answered in eduladder.How to answer a question
Career: Work or do your internship with us.Work with us
Create a video: You can teach anything and everything each video should be less than five minutes should cover the idea less than five min.How to upload a video on eduladder