Module 5: Normalizing the Logical Data Design

Keys are identifying values assigned to each instance of an entity within a data model. As you learned in Module 4, “Deriving a Logical Data Design,” entities within a data model represent a grouping of information about people, places, objects, or ideas. When you begin to move a logical design to a physical design, you use keys to uniquely identify each instance of an entity within the data model.

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