Please enable JavaScript.
Coggle requires JavaScript to display documents.
Chapter 2 (Business Rules (Optionality (Optional:Mandatory, Mandatory…
Chapter 2
Business Rules
Conditions
Constriants
Cardinality
1: M
One to Many
1:1
One and only one
M: M
Many to Many
Optionality
Optional:Mandatory
Mandatory:Optional
Optional: Optional
Mandatory: Mandatory
Multiple Relationships
Models
Conceptual
WHAT
Computer Independent Model (CIM)
Logical
HOW
Platform Independent Model (PIM)
Physical
HOW
Platform Specific Model (PSM)
Entity Relationship Modelling
Entity
Group of
Entity Type
PERSON
Singular
ACCOUNT
Not
ACCOUNTS
Noun
Not Techie Speak or notation
Instance of
Entity Occurrence
Gillian Reid
Relationship
Solid Line
Mandatory
Must Be
Dashed Line
Optional
May Be
Crows Feet
One or More
Single Line (No Feet)
One and only one
Recursive
Class Modelling
Object
Group of
Object Class
COURSE
Instance of
Object Occurrence
Data Analysis
Association
Solid Line
Numbers
Mandatory
1..1 (one and only one)
Optional
0..1 (zero or one)
Mulitplicity
Lower bound
Upper Bound
Asterisk *
Many (infinity)
Reflexive
Role Names