All Data models in DBMS
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
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A data is known as the row fact which is stored incomputers memory and used by the user as theoutput.
Example-21.
Data
InformationCollection 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 Model A data model is a collection of concepts thatcan be used to describe the structure of adatabase.
Types of Data Models
1.Record Base model
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Types of Data Models
1.Record Base model • A record based data modelis used to specify the overalllogical structure of thedatabase.
• Each record type defines afixed no. of fields having afixed length.
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Relational model
• In the relational model, data is
organized in two-dimensional tablescalled relations.
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Relations
No Course-Name Unit
CIS15 Intro to C 5
CIS17 Intro to Java 5
CIS19 UNIX 4
CIS51 Networking 5
Attributes
Tuples
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• Attributes.
Each column in a relation is called an attribute.
Relations
• Tuples
Each row in a relation is called a tuple. Atuple defines a collection of attribute values.
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Network ModelIn the network model, the entities are
organized in a graph, in which some entitiescan be accessed through several paths
No Name ID Name Course
No Name Unit ID Name
DEPARTMENT
COURSES
STUDENTS
PROFESSORS
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Hierarchical Model
The hierarchical data model organizesdata in a tree structure
PROFESSORS
No Name
ID Name CourseNo Name Unit
ID Name
DEPARTMENT
COURSES STUDENTS
Hierarchical Model
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2.Entity Relationship Model
• The E-R (entity-relationship) data model views the real world as a set of basic objects (entities) and relationshipsamong these objects
ER Model Basics•Entity•Entity Set•Attributes•Relationship
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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.
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