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Tài liệu Activity 4.2: Creating a Logical Data Model ppt

Tài liệu Activity 4.2: Creating a Logical Data Model ppt

... actions that define the relationship between each pair of entities, and label the line with the relationship verb This is the initial ER diagram for the logical data model Answer in v04_160 9a_ act42-1.bmp ... cardinality and existence characteristics of each of the relationships defined in Exercise ! Identify cardinality For each relationship on your ER diagram, ask the question “How many of the parent ... v04_160 9a_ act42-1.bmp Activity 4.2: Creating a Logical Data Model Exercise 2: Determining Cardinality and Existence In this exercise, you will use the syntax discussed in the module to identify the cardinality...

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