1. 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

2. Entity
Weak Entity
Attribute
Rahul Khanvani Binarybuzz.Wordpress.com

3. Key Attribute
Composite
_________
Attribute
Rahul Khanvani Binarybuzz.Wordpress.com

4. Derived Attribute
Multi valued Attribute
Rahul Khanvani Binarybuzz.Wordpress.com

5. Table: Employee
Entity
Rahul Khanvani Binarybuzz.Wordpress.com

6. Table: Employee
Employee
number
Name
Attributes
Rahul Khanvani Binarybuzz.Wordpress.com

7. Table: Employee
Employee
number
Name Birth Date Age Salary
Key AttributeRahul Khanvani Binarybuzz.Wordpress.com

8. Table: Employee
Employee
number
Name Address Age Salary
Composite
Attribute
Rahul Khanvani Binarybuzz.Wordpress.com

9. Table: Employee
Employee
number
Name Address Age Salary
Multi Valued
Attribute
Rahul Khanvani Binarybuzz.Wordpress.com

10. Table: Employee
Employee
number
Name Address Age Salary
Single Valued
Attribute
Rahul Khanvani Binarybuzz.Wordpress.com

11. Table: Employee
Employee
number
Name Address Fax No /
Tele. No
Salary
Null Valued
AttributeRahul Khanvani Binarybuzz.Wordpress.com

12. Table: Employee
Employee
number
Name Birth Date Age Salary
Derived
Attribute
Rahul Khanvani Binarybuzz.Wordpress.com

13. Table: Employee
Employee
number
Name Birth Date Age Salary
Stored
Attribute
Rahul Khanvani Binarybuzz.Wordpress.com

14. Employee
Entity
Rahul Khanvani Binarybuzz.Wordpress.com

15. Employee
Attributes
Emp_no
Birth Date
Age
Salary
Name
Rahul Khanvani Binarybuzz.Wordpress.com

16. Key
Attribute
Emp_no
Employee
Birth Date
Salary
Name
Rahul Khanvani Binarybuzz.Wordpress.com

17. Employee
Key
Attribute
Emp_no
Birth Date
Salary
Name
Rahul Khanvani Binarybuzz.Wordpress.com

18. Employee
Emp_no
Name
Salary
Name
Multi valued
Attribute
Rahul Khanvani Binarybuzz.Wordpress.com

19. Employee
Multi valued
Attribute
Emp_no
Name
Salary
Name
Rahul Khanvani Binarybuzz.Wordpress.com

20. Employee
Address
Composite
AttributeRahul Khanvani Binarybuzz.Wordpress.com

21. Employee
Name
Composite
Attribute
Street
Address
Area
City
Rahul Khanvani Binarybuzz.Wordpress.com

22. Employee
Emp_no
Birth Date
Age
Salary
Name
Derived
Attributes
Rahul Khanvani Binarybuzz.Wordpress.com

23. Employee
Derived
Attributes
Emp_no
Birth Date
Age
Salary
Name
Rahul Khanvani Binarybuzz.Wordpress.com

24. RelationshipWorks
Link
Rahul Khanvani Binarybuzz.Wordpress.com

25. Manager
Mno Name
Salary
Birth
Date
Department
Mno Dname
Works
11
1 To 1 RelationshipRahul Khanvani Binarybuzz.Wordpress.com

26. Employee
Empno Name
Salary
Birth
Date
Department
Empno Dname
Works
1M
Many To 1 RelationshipRahul Khanvani Binarybuzz.Wordpress.com

27. Employee
Empno Name
Salary
Project
PId Ptype
Works
NM
Many To Many Relationship
Start
date
End
date
Rahul Khanvani Binarybuzz.Wordpress.com

28. ER Diagram Of Banking System
Bank
Bank
branch
Branc
hes
Account
Acct no
Balanc
e
Acc
Type
Accts Loans
Loan
Loan
no
Amount
Loan
Type
1 M
1
M
1
M
Bno Addr
Nam
e
Code Addr
Rahul Khanvani Binarybuzz.Wordpress.com

29. Continue… Account Loan
Customer
SSn
Name
Addres
s
A_c L_c
n
M
n
M
Phone
Rahul Khanvani Binarybuzz.Wordpress.com

30. Thank You…
Rahul Khanvani
Binarybuzz.Wordpress.com