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Discrete data element - PowerPoint PPT Presentation

The single entity

The single entity. I want to be alone Greta Garbo. Modeling reality. A database must mirror the real world if it is to answer questions about the real world Data modeling is a design technique for capturing reality. Reality matters. An entity. Some thing in the environment

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566 views • 41 slides

The single entity

The single entity. Modeling reality. A database must mirror the real world if it is to answer questions about the real world Data modeling is a design technique for capturing reality. An entity. Some thing in the environment Represented by a rectangle

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526 views • 36 slides

Chapter 3: The E-R Diagram

Chapter 3: The E-R Diagram. Modeling Reality. A database must mirror the real world if it is to answer questions about the real world Data Modeling is a design technique for capturing reality. STUDENT. Social_Security_No Name Major. The Conceptual Model (ER diagram).

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486 views • 25 slides

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Discrete data element - PowerPoint PPT Presentation

The single entity

The single entity

Chapter 3: The E-R Diagram