Normalization and types of normalization, DOT NET Programming

What is normalization & what are the types of normalization?

Normalization is a set of rules that have been established to aid in the design of tables that are meant to be connected through relationships. This set of rules is termed as Normalization.

The advantages of normalizing your database will include following points:

  • Avoiding of the repetitive entries
  • Reducing the required storage space
  • Preventing the need to restructure existing tables to accommodate the new data.
  • To increased the flexibility of queries, speed and sorts, and summaries.

The three normal forms are illustrated below:-

1)First Normal Form :

For a table to be in the first normal form, the data must be broken up into the smallest possible units .In addition to breaking the data  into the smallest meaningful values, the tables in first normal form should not contain any repetitions groups of fields.

409_first normal form.png

Figure :- Repeating groups example

For this in the above example city1 & city2 are repeating.In order to show this table to be in First normal form you have to change the table structure as follows.Also note that the Customer Name is now broken down to first name and the last name (First normal form data must be broken down to smallest unit).

14_second normal form.png

2)Second Normal form:

The second normal form states that every field in a multiple field, primary keytable should be directly related to the whole primary key. Or in the other words, each non-key field must be a fact of about all the fields in the primary key. In the  table above of customer, the city is not linked to any primary field.

1809_second normal form1.png

Figure:- Normalized customer table.

2108_second normal form2.png

Figure :- City is now shifted to a different master table.

3)Third normal form:

The non-key field should not depend on other Non-key field. The field "Total" is dependent on the "Unit price" and the "qty".

930_thid normal form.png

Figure :- Fill third normal form

Posted Date: 9/24/2012 4:38:20 AM | Location : United States







Related Discussions:- Normalization and types of normalization, Assignment Help, Ask Question on Normalization and types of normalization, Get Answer, Expert's Help, Normalization and types of normalization Discussions

Write discussion on Normalization and types of normalization
Your posts are moderated
Related Questions
What are satellite assemblies? We use resource files to store data according to the localized languages. But when you actually go for the deployment you will not like to also i

Hi, I have been working on Dot Net over the past few years. I would like to do online tutoring for .NET. Could you please let me know the possible oppurtunities

What is the purpose of DOTNET? Dot Net Is a collection of products like C#, ASp.Net, Vb.Net, XML. The purpose of .Net is that we can simply upgrade and degrade our programs whi

What is a class? A class describes all the attributes of objects, as well as the methods that execute the behaviour of member objects. It is a comprehensive data type, which sh

What is cloud computing? The cloud computing is the computing which is completely based on the Internet. It can also be explained as the next stage in the evolution of the Inte

I need CELL PHONE PINGING for fugitive tracking Project Description: I want an application like the following: it provides cell phone pinging(location information via gps) wi

Which command-line tool generates code and mapping for the LINQ to SQL component of .NET Framework? The SqlMetal.exe command-line tool generates code and map the LINQ to SQL co

Site minder Authentication in SharePoint We have fit site minder agent in SharePoint 2010. We would like to have incorporate with site minder agent. Currently site-minder age

What is the difference between the Clone() and Copy() methods of the DataSet class? The Clone() method copies only the structure of a DataSet. The copied structure having all t

Question: (a) List and describe the four parameters contained in the second section of the AdRotator Scheduler File. (b) Distinguish between the following types of "Locks"