Post on 27-Jan-2015
description
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
Rahul Khanvani Binarybuzz.Wordpress.com
Key Attribute
Composite
_________
Attribute
Rahul Khanvani Binarybuzz.Wordpress.com
Derived Attribute
Multi valued Attribute
Rahul Khanvani Binarybuzz.Wordpress.com
Table: Employee Entity
Rahul Khanvani Binarybuzz.Wordpress.com
Table: Employee
Employee number
Name
Attributes
Rahul Khanvani Binarybuzz.Wordpress.com
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
Rahul Khanvani Binarybuzz.Wordpress.com
Table: Employee
Employee number
Name Address Fax No / Tele. No
Salary
Null Valued Attribute
Rahul Khanvani Binarybuzz.Wordpress.com
Table: Employee
Employee number
Name Birth Date Age Salary
Derived Attribute
Rahul Khanvani Binarybuzz.Wordpress.com
Table: Employee
Employee number
Name Birth Date Age Salary
Stored Attribute
Rahul Khanvani Binarybuzz.Wordpress.com
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
Rahul Khanvani Binarybuzz.Wordpress.com
Employee
Address
Composite
Attribute Rahul Khanvani Binarybuzz.Wordpress.com
Employee
Name
Composite
Attribute
Street Address
Area City
Rahul Khanvani Binarybuzz.Wordpress.com
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
Rahul Khanvani Binarybuzz.Wordpress.com
Relationship Works
Link
Rahul Khanvani Binarybuzz.Wordpress.com
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
Rahul Khanvani Binarybuzz.Wordpress.com
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
Rahul Khanvani Binarybuzz.Wordpress.com
Continue… Account Loan
Customer
SSn
Name
Address
A_c L_c
n
M
n
M
Phone
Rahul Khanvani Binarybuzz.Wordpress.com
Thank You…
Rahul Khanvani Binarybuzz.Wordpress.com