Exam 5: Data Modeling With the Entity-Relationship Model

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You are given an E-R diagram with two entities,ORDER and CUSTOMER,as shown above,and are asked to draw the relationship between them.If a given customer can place only one order and a given order can be placed by at most one customer,which of the following should be indicated in the relationship symbol between the two entities?

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Which of the following is not a common variant of the E-R model?

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Discriminators can be ________.

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A data model is a plan for a database design.

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