Data Models In DBMS

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Overview

• Data

• Information

• Database

• Data Model

Types of Data Model

1. Record Base model

•Relationship model

•Network Model

•Hierarchical Model

2.Entity Relationship Model

3.Object-Oriented Model

A data is known as the row fact which is stored in computersmemory and used by the user as the output.

Data

Information

Collection of data its called information.

Example-House no 21C-S-1,Sch No 78 Indore

DatabaseA collection of inter related data its called

database.

Data ModelA data model is a collection of concepts that can be used to describe the structure of a database.

Types of Data Models

1.Record Base model

Types of Data Models

1.Record Base model • A record based data model is

used to specify the overall

logical structure of the database.

• Each record type defines a fixed

no. of fields having a fixed

length.

Relational model

• In the relational model, data is

organized in two-dimensional tables

called relations.

Relations

No Course-Name Unit

CIS15 Intro to C 5

CIS17 Intro to Java 5

CIS19 UNIX 4

CIS51 Networking 5

Attributes

Tuples

Relations

• Attributes.

Each column in a relation is called an attribute.

• Tuples

Each row in a relation is called a tuple. A tuple defines

a collection of attribute values.

Network Model

In the network model, the entities are

organized in a graph, in which some entities

can be accessed through several paths

No Name ID Name Course

No Name Unit ID Name

DEPARTMENT

COURSES

STUDENTS

PROFESSORS

Hierarchical Model

The hierarchical data model organizes data in a

tree structure

PROFESSORS

ID Name CourseNo Name Unit

ID Name

DEPARTMENT

No Name

COURSES STUDENTS

Hierarchical Model

2.Entity Relationship Model

• The E-R (entity-relationship) data model views the real world as a set

of basic objects (entities) and relationships among these objects

ER Model Basics

•Entity

•Entity Set

•Attributes

•Relationship

Entity

• entity is a thing in the real world with an independent existance. and

entity set is collection or set all entities of a particular entity type at any

point of time.