OMIS-452-SP16 - Week 6a - OMIS 452 Database Management for...

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OMIS 452 Database Management for Business Northern Illinois University Brian Bender
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Agenda Ch. 5 – Entity Relationship Data Model P.3 – Introduction A Look Ahead OMIS-452 Week 6a 2
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Ch. 5 – Entity Relationship Model Data Model Plan For Database Design Entity-Relationship (E-R) Model Standard For Database Design Graphical Depiction Of… Entities – Something People Want To Track Tables – Entity Class, Relation Attributes – Characteristics Of Entities Relationships – Association Between Entity Instances Identifiers – A Key By Any Other Name OMIS-452 Week 6a 3
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Ch. 5 – Entity Relationship Model Relationships Can Exist… Between Entity Classes (Tables) Relationship Class Between Entity Instances (Records) Relationship Instance Degrees Of Relationships Between Two (2) Relationship Classes Binary Between Three (3) Relationship Classes Ternary OMIS-452 Week 6a 4
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Ch. 5 – Entity Relationship Model Cardinality Count Of The Relationship Maximum Minimum – Must Participate Zero (0) = Optional One (1) = Mandatory One-To-One (1:1) One-To-Many (1:N) – Parent Child Many-To-One (N:1) Many-To-Many (N:M) OMIS-452 Week 6a 5
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Ch. 5 – Entity Relationship Model Crow’s Foot Notation ( Required In P.3 ) OMIS-452 Week 6a 6
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Ch. 5 – Entity Relationship Model
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