Chapter3 - The Entity-Relationship Model 1 INTRODUCTION

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Unformatted text preview: The Entity-Relationship Model 1 INTRODUCTION ..................................................................................................................................... 1 2 ER CONSTRUCTS ................................................................................................................................... 1 2.1 ENTITIES ............................................................................................................................................... 1 2.1.1 What and Notations ...................................................................................................................... 1 2.1.2 Entity vs. Entity Type ................................................................................................................... 1 2.1.3 Strong vs. Weak ............................................................................................................................ 1 2.2 ATTRIBUTES ......................................................................................................................................... 1 2.2.1 What and Notations ...................................................................................................................... 1 2.2.2 Simple vs. Composite ................................................................................................................... 1 2.2.3 Single vs. Multi-valued ................................................................................................................. 2 2.2.4 Stored vs. Derived ........................................................................................................................ 2 2.2.5 Identifier ....................................................................................................................................... 22....
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Chapter3 - The Entity-Relationship Model 1 INTRODUCTION

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