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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An Instance of the Customer Entity
This Customer entity
has eight attributes
* Customer ID
* Order ID
* Customer Name
* Order Date
Cust_ID Last_Name First_Name Address City ST Zip
0001 Snerd Mortimer General Delivery Tampa FL 33647
0002 Fogg Bob 567 Fogg Lane Omaha NE 32405
0003 Amos Famous 2 Cookie Ct. Miami FL 33133
0004 Targa Maxine 67 Fast Lane Clinton NJ 20082
0005 George Scott 56 Neat St. Boulder CO 35882
0006 Guy Nice 290 Pleasant St. Tampa FL 33641
0007 Smith Bob 76 Quaker Path Wynn NY 21118
0009 Smith James 234 Bayview Tampa FL 33641Example Entity & Instances
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