Monday, March 21, 2011
WEEK 4
Entity Relationship Diagram (ERD/ER Model)
Notation Of ER Model
Notation Of ER Model
Type of Attribute
Type of Attribute
Cardanality Constraint
1: M => one to many
M : 1 => many to one
M : M => many to many
1 : 1 => one to one
Relational Key
Enables us to link the tables together in a database for easier data access storage
Types Of Relational Keys
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