Please enable JavaScript.
Coggle requires JavaScript to display documents.
Chapter 4 (Composition (Whole, Cannot exist independently, Black Diamond,…
Chapter 4
Composition
Whole
Cannot exist independently
Black Diamond
Delete ALL
1:1
Generalisation
Subtype
Supertype
Looking Up
PERSONAL
ACCOUNT
#
COMPANY
ACCOUNT
#
Aggregation
Independent Existence
Whole-Part
White Diamond
0:1
Many to Many
Can be Valid
Hidden relationship/association
replace with 1:M
ERM
Associative Entity Tyoe
Class Modelling
Associative class
Specialisation
Supertype
Subtype
Looking down
ACCOUNT
PERSONAL
COMPANY
Rules
Entity Relationship Modelling
Subtypes Mutually Exclusive
DISJOINT
Either/OR
Hierarchy COMPLETE
Subtypes immutable - STATIC
Class Modelling
DISJOINT
either/or
OVERLAPPING
can be either
COMPLETE
Superclass + subclass
INCOMPLETE
Superclass +/- subclass
STATIC
Cannot Change class
DYNAMIC
Can change class
Recursive/Reflexive
Replace with Bill of Material Concept
PRODUCT
PRODUCT SPECIFICATION
Mutually Exclusive
Either/Or
Relationship
Arc
Dots
Association
{xor}
Example
ACCOUNT
PERSONAL
COMPANY