Normalization: The process used to minimize data redundancy and dependency in a relational database is known as normalization. The database table is divided into two or more tables and defines the relationship between those tables. First normal form (1NF): If a table does not contain any replicate fields or groups of fields then that model is called as first normal form. In this form, entities do not contain any single instance of the repeating variable. It means that the entities contain only one instance of the attributes, multi-valued attributes are neglected. Second normal form (2NF): The value of all non-primary key attributes should be dependent on the primary key attribute. If any attribute is depending on the partial primary key then it should determine the other attributes for an instance of the entity. The partial dependencies should be removed from the data model. Third normal form (3NF): The value of any non-primary key attributes will not depend on any other non-primary key attributes. If any non-primary key attributes depend on any other non-primary key attribute then it should be moved or deleted. It is termed as transitive dependency. Partial dependency: A partial dependency exists at that time of an attributes depends only a part of primary key. This dependency is related with 1 st normal form. Transitive dependency: A transitive dependency exists at that time of an attributes depends on another attribute which is not part of primary key. Functional dependency: An association between two attributes or two set of attributes in a same relational database table, which is having some constraints is known as functional dependency. In a table one attribute is functionally dependent on another attribute to take one value.

Question

The dependency diagram indicates that authors are paid royalty for each book they write for a publisher.The amount of royalty can vary by author,by book ,and by edition of the book. a.Based on the dependency diagram,create a database whose tables are atleast in 2NF showing the dependency diagram for each table. b.Create a database whose tables are atleast in 3NF,showing the dependency diagram for each table.

Answer 1

Question

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Chapter 6, Problem 6RQ

a.

Program Plan Intro

Normalization:

The process used to minimize data redundancy and dependency in a relational database is known as normalization. The database table is divided into two or more tables and defines the relationship between those tables.

First normal form (1NF):

If a table does not contain any replicate fields or groups of fields then that model is called as first normal form.

In this form, entities do not contain any single instance of the repeating variable.

It means that the entities contain only one instance of the attributes, multi-valued attributes are neglected.

Second normal form (2NF):

The value of all non-primary key attributes should be dependent on the primary key attribute.

If any attribute is depending on the partial primary key then it should determine the other attributes for an instance of the entity.

The partial dependencies should be removed from the data model.

Third normal form (3NF):

The value of any non-primary key attributes will not depend on any other non-primary key attributes.

If any non-primary key attributes depend on any other non-primary key attribute then it should be moved or deleted.

It is termed as transitive dependency.

Partial dependency:

A partial dependency exists at that time of an attributes depends only a part of primary key. This dependency is related with 1^st normal form.

Transitive dependency:

A transitive dependency exists at that time of an attributes depends on another attribute which is not part of primary key.

Functional dependency:

An association between two attributes or two set of attributes in a same relational database table, which is having some constraints is known as functional dependency.

In a table one attribute is functionally dependent on another attribute to take one value.

b.

Explanation of Solution

Dependencies diagrams for each database table:

Table1:

Create the database table with name of Table1 is given below:

Table1 (C1, C2)

C2 are partial dependent on C1.

Normal form:

The relation is in third normal form (3NF), since there is no transitive dependency and no repeated attributes.

The representation of dependency diagram for table1 is shown below:

c.

Explanation of Solution

Dependencies diagrams for each database table:

Table1:

Create the database table with name of Table1 is given below:

Table1 (C1, C2)

Here, C1 indicate the primary key.

C2 are partial dependent on C1.

Normal form:

The relation is in third normal form (3NF), since there is no transitive dependency and no repeated attributes.

The representation of dependency diagram for table1 is shown below:

Table2:

Create the database table with name of Table2 is given below:

Table2 (C1, C3, C4)

Here, C1 and C3 indicate the primary key and C1 indicates the foreign key that belongs to Table1 and C4 indicates the foreign key that belongs to Table3.

Normal form:

The relation is in third normal form (3NF), since there is no transitive dependency and no repeated attributes...

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