Er diagram practical examples

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


Derived Attribute

Multi valued Attribute


Table: Employee Entity


Table: Employee

Employee number

Name

Attributes


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


Table: Employee

Employee number


Multi Valued Attribute


Table: Employee

Employee number


Single Valued Attribute


Table: Employee

Employee number

Name Address Fax No / Tele. No

Salary

Null Valued Attribute


Table: Employee

Employee number


Derived Attribute


Table: Employee

Employee number


Stored Attribute


Employee

Entity


Employee

Attributes

Emp_no

Birth Date

Age

Salary

Name


Key Attribute

Emp_no

Employee

Birth Date

Salary

Name


Employee

Key Attribute

Emp_no

Birth Date

Salary

Name


Employee

Emp_no

Name

Salary

Name



Employee


Emp_no

Name

Salary

Name


Employee

Address

Composite

Attribute Rahul Khanvani Binarybuzz.Wordpress.com

Employee

Name

Composite

Attribute

Street Address

Area City


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


Relationship Works

Link


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


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


Continue… Account Loan

Customer

SSn

Name

Address

A_c L_c

n

M

n

M

Phone


Thank You…


Technology

Er diagram practical examples