DBMS DATA MODELS

1. All Data models
in DBMS
Submitted By-
Submitted To-

2. 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

3. A data is known as the row fact which is stored in computers
memory and used by the user as the output.
Example-21.
Data

4. Information
Collection of data its called information.
Example-House no 21C-S-1,Sch No 78 Indore

5. Database
A collection of inter related data its called
database.

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

7. Types of Data Models
1.Record Base model

8. 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.

9. Relational model
• In the relational model, data is
organized in two-dimensional tables
called relations.

10. Relations
No Course-Name Unit
CIS15 Intro to C 5
CIS17 Intro to Java 5
CIS19 UNIX 4
CIS51 Networking 5
Attributes
Tuples

11. • Attributes.
Each column in a relation is called an attribute.
Relations
• Tuples
Each row in a relation is called a tuple. A tuple defines
a collection of attribute values.

12. 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

13. Hierarchical Model
The hierarchical data model organizes data in a
tree structure

14. PROFESSORS
No Name
ID Name Course
No Name Unit
ID Name
DEPARTMENT
COURSES STUDENTS
Hierarchical Model

15. 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

16. 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.