ppt on dfd and erd

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Data Flow DiagramAndE-R Diagram
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Index

• Section 1
• Data Flow Diagram
• Introduction
• What Is DFD?
• DFD Symbols
• Example

• Section 2
• Entity - Relationship Diagram
• What Is ERD?
• Components
• Creating ERD
• Example

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Section 1

• Data Flow Diagram

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INTRODUCTION Of DFD

• Shows the context into which the business process
  fits
• Shows the overall business process as just one
  process
• Shows all the outside entities that receive
  information from or contribute information to the
  system

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Data Flow Diagram Key Definitions
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DFD Elements
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Process that transform data flow
A source or destination of data
Data store
Data flow
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DFD Example
login
ATM
money
user
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Applies to university
Student
progress report
application
denial letter
Approval
acceptance letter
student information
Registr-ation
Student database
student information
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Section 2

• E-R Diagram

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What is EntityRelationship Diagram?
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Components Of An ERD
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The steps involved in creating an ERD are
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E-R diagram example
song
performs
artist

• artist performs song
• song is performed by artist

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Attribute
Attribute
Attribute
Attribute
Attribute
relationship
Entity 1
Entity 2
relationship
Entity 3
Attribute
Attribute
Attribute
Attribute
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sub. name
grp. ID
sub. ID
name
Subject
Group
date
mark ID
mark
supervi-ses
Mark
belong
gives
Student
Teacher
teacher ID
last name
last name
student ID
first name
first name
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THANK YOU

• Presented By-
• Sakshi Rastogi