An entity-relationship diagram (ERD) is a data modeling technique that graphically illustrates an information system’s entities and the relationships between those entities. An ERD is a conceptual and representational model of data used to represent the entity framework infrastructure. DBA and System Analyst used ERD to perform data modeling and explain the diagram to the stakeholders.

1. There is no limit to learn
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iSchool
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2. MD. Abdullah Al Nasim
15.01.04.085
Masud Rana
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Sarwar Saif
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Samiur Rahman
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Presented By
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ERD ?
WHAT IS
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A diagram used to conduct data
modeling activity
Describes the relationship between
data and object
Entity Relationship Diagram

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COMPONENTS ?
WHAT ARETHE
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Entity
Attribute
Relationship
Components of ERD
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ENITY SETS ?
WHAT ARETHE
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8. User
Information
Course
Content
Tutor
Comment
Entity Sets
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RELATIONSHIPS?
WHAT ARETHE
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10. Has
Tutor review
Takes
Course-content
User review
Relationships
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11. ATTRIBUTES
and
DATA TYPES?
WHAT ARETHE
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Attributes and Data type of User
UserId int(11)
UserName varchar(32)
Email varchar(32)
Status varchar(32)
Accesskey varchar(32)
Time datetime
Password varchar(32)

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Attributes and Data type of Information
UserId int(11)
FirstName varchar(16)
LastName varchar(16)
DateOfBirth date
Gender varchar(6)
Creationdate datetime

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Attributes and Data type of Course
CourseId int(11)
CourseName varchar(255)
CourseHour int(5)
CourseDept varchar(32)

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Attributes and Data type of Content
ContentId int(11)
ContentTitle varchar(255)
ContentType varchar(32)
ContentUrl varchar(255)
ContentSummary varchar(255)

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Attributes and Data type ofTutor
TutorId int(11)
TutorName varchar(32)
AccessId varchar(32)
TakenCourse int(11)

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Attributes and Data type of Comment
Id int(11)
Commentdata varchar(255)

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Attributes and Data type of User Review
UserId int(11)
Id int(11)
Time datetime
Commentdata comment

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Attributes and Data type ofTakes
UserId int(11)
CourseId int(11)
Grade varchar(16)

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Attributes and Data type of Contentcourse
ContentcourseId int(11)
CourseName varchar(255)
ContentName varchar(255)

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Attributes and Data type ofTutorReview
Id int(11)
Tutor-id int(11)
Time datetime
Comment-data varchar(255)

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Attributes with Symbols
Simple Attribute:
Composite Attribute:
Derived Attribute:
Multivalued Attribute:
( )

23. Enity Relationship Diagram (ERD)
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24. T H A N K
Y O U
F O R
E V E R Y T H I N G

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