ppt on dfd and erd - PowerPoint PPT Presentation

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ppt on dfd and erd

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Title: ppt on dfd and erd


1
Data Flow DiagramAndE-R Diagram
2
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

3
Section 1
  • Data Flow Diagram

4
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

5
Data Flow Diagram Key Definitions
6
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7
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8
DFD Elements
9
Process that transform data flow
A source or destination of data
Data store
Data flow
10
DFD Example
login
ATM
money
user
11
Applies to university
Student
progress report
application
denial letter
Approval
acceptance letter
student information
Registr-ation
Student database
student information
12
Section 2
  • E-R Diagram

13
What is EntityRelationship Diagram?
14
Components Of An ERD
15
The steps involved in creating an ERD are
16
E-R diagram example
song
performs
artist
  • artist performs song
  • song is performed by artist

17
Attribute
Attribute
Attribute
Attribute
Attribute
relationship
Entity 1
Entity 2
relationship
Entity 3
Attribute
Attribute
Attribute
Attribute
18
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
19
THANK YOU
  • Presented By-
  • Sakshi Rastogi
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