Er diagram practical examples
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What to do ?
How to do ?
What kind of Data should be
considered?
ER Diagram Practical Example
Prepared By… Rahul Khanwani BinaryBuzz.Wordpress.com
Rahul Khanvani
Binarybuzz.Wordpress.
com
Entity
Weak Entity
Attribute
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Key Attribute
Composite
_________
Attribute
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Derived Attribute
Multi valued Attribute
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Table: Employee Entity
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Table: Employee
Employee number
Name
Attributes
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Table: Employee
Employee number
Name Birth Date Age Salary
Key Attribute Rahul Khanvani Binarybuzz.Wordpress.com
Table: Employee
Employee number
Name Address Age Salary
Composite Attribute
Rahul Khanvani Binarybuzz.Wordpress.com
Table: Employee
Employee number
Name Address Age Salary
Multi Valued Attribute
Rahul Khanvani Binarybuzz.Wordpress.com
Table: Employee
Employee number
Name Address Age Salary
Single Valued Attribute
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Table: Employee
Employee number
Name Address Fax No / Tele. No
Salary
Null Valued Attribute
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Table: Employee
Employee number
Name Birth Date Age Salary
Derived Attribute
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Table: Employee
Employee number
Name Birth Date Age Salary
Stored Attribute
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Employee
Entity
Rahul Khanvani Binarybuzz.Wordpress.com
Employee
Attributes
Emp_no
Birth Date
Age
Salary
Name
Rahul Khanvani Binarybuzz.Wordpress.com
Key Attribute
Emp_no
Employee
Birth Date
Salary
Name
Rahul Khanvani Binarybuzz.Wordpress.com
Employee
Key Attribute
Emp_no
Birth Date
Salary
Name
Rahul Khanvani Binarybuzz.Wordpress.com
Employee
Emp_no
Name
Salary
Name
Multi valued Attribute
Rahul Khanvani Binarybuzz.Wordpress.com
Employee
Multi valued Attribute
Emp_no
Name
Salary
Name
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Employee
Address
Composite
Attribute Rahul Khanvani Binarybuzz.Wordpress.com
Employee
Name
Composite
Attribute
Street Address
Area City
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Employee
Emp_no
Birth Date
Age
Salary
Name
Derived
Attributes Rahul Khanvani Binarybuzz.Wordpress.com
Employee
Derived
Attributes
Emp_no
Birth Date
Age
Salary
Name
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Relationship Works
Link
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Manager
Mno Name
Salary Birth Date
Department
Mno Dname
Works
1 1
1 To 1 Relationship Rahul Khanvani Binarybuzz.Wordpress.com
Employee
Empno Name
Salary Birth Date
Department
Empno Dname
Works
1 M
Many To 1 Relationship Rahul Khanvani Binarybuzz.Wordpress.com
Employee
Empno Name
Salary
Project
PId Ptype
Works
N M
Many To Many Relationship
Start date
End date
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ER Diagram Of Banking System
Bank Bank
branch Branc
hes
Account
Acct no
Balance
Acc Type
Accts Loans
Loan
Loan no
Amount Loan Type
1 M
1
M
1
M
Bno Addr
Name
Code Addr
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Continue… Account Loan
Customer
SSn
Name
Address
A_c L_c
n
M
n
M
Phone
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Thank You…
Rahul Khanvani Binarybuzz.Wordpress.com