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Question: What is normalization and different kinds of normalization?

Answer: It is 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 known as Normalization.
Benefits of normalizing your database will include:
√ Avoiding repetitive entries
√ Reducing required storage space
√ Preventing the need to restructure existing tables to accommodate new data.
√ Increased speed and flexibility of queries, sorts, and summaries.



Category SQL Interview Questions & Answers - Exam Mode / Learning Mode
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Question: What is normalization and different kinds of normalization?

Answer:

It is 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 known as Normalization.
Benefits of normalizing your database will include:
√ Avoiding repetitive entries
√ Reducing required storage space
√ Preventing the need to restructure existing tables to accommodate new data.
√ Increased speed and flexibility of queries, sorts, and summaries. Source: CoolInterview.com

Answered by: Revathy | Date: 1/30/2008 | Contact Revathy Contact Revathy

Normalization is a process of decomposing a complex table into simplest form.The main idea is to reduce the redundancy.Usually,it divides the database into 2 0r more tables and define a relationship between them.The main objective is to isolate the data,so that if any modifications or updation is needed for a field,then it can be done just in one table and can be propagated to other tables in the dbase via the defined relationships.
There are many types of normal form,1NF,2nd NF,3rd NF,4thNF etc.
2. Joins are used to identify the relationships between the tables.
Inner join,outer join(left outer join,right outer join),self join,cross join Source: CoolInterview.com

Answered by: guest | Date: 2/11/2008 | Contact guest Contact guest

NORMALIZATION: It is a process of efficiently organizing the data in the database.
Kinds of Normalization:
First NF: Duplicate columns should be eliminated.
Second NF: Should be 1NF. Should remove subsets of data that repeats in multiple rows and place them in separate table.
Third NF: Should be in 2NF. Repeat columns that are not dependent upon the primary key.
Boyce-Codd NF: Should be in 3NF. A relation is in BCNF if every determinant is a candidate key.
Fourth NF: Should be in 3NF and BCNF. A relation is in 4NF if it has no more than one multi-valued or multiple dependency.
JOINS: Join puts the data from two or more tables into a single result set.
Types of Joins:
1. Inner Join or Equi Join
2. Outer Join (Left,Right,Full)
3. Cross Join
4. Self Join Source: CoolInterview.com

Answered by: T Swetha | Date: 2/12/2008 | Contact T Swetha Contact T Swetha

NORMALIZATION IS THE PROCESS OF DECOMPOSING THE DATABASE TABLES TO ACHIEVE CONSISTENCY AND DATA REDUNDANCY.
THE FOLLOWING ARE NORMALIZATION FORMS
1.I normal form
2.II normal form
3.III normal form
4.BCNF
5.IV normal form
6.V normal form

JOINS:
clubbing of two or more tables by referring at least one column matching in the both tables.
types of joins:

NATURAL JOIN
LEFT JOIN
LEFT OUTER JOIN
RIGHT OUTER JOIN


Source: CoolInterview.com

Answered by: Ranjeeth Kumar | Date: 3/14/2008 | Contact Ranjeeth Kumar Contact Ranjeeth Kumar

1.Normalization is a process of well-organized data into the table.
Normally we use Boycode Normal form(BNF)
2.Different kinds of joins :
Inner Join
Outer Join
Cross Join
Outer Joins contains :left Outer Join,Right outer join Source: CoolInterview.com

Answered by: Muthu | Date: 3/21/2008 | Contact Muthu Contact Muthu


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