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A We cannot keep track of employees that do not sign up any customers B We cannot keep track of employees that do not serve any customers C We cannot keep track of employees that serve multiple customers D We cannot keep track of employees that sign up multiple customers Answer: C Diff: 3 Page Ref: 46 Which of the following is true according to the ZYX Company ER diagram?

A We cannot keep track of authors that did not write any of the library books B We cannot keep track of authors that wrote only one of the library books C We cannot keep track of authors that wrote multiple library books D We cannot keep track of authors that wrote more than 10 library books Answer: A Diff: 3 Page Ref: 2. Answer: TRUE Diff: 2 Page Ref: 22 In an ER diagram, each entity is always connected to all of the other entities, either via a direct relationship or indirectly via other entities and relationships.

Answer: Entity-relationship ER modeling, a widely used conceptual database modeling method, is a technique that enables the structuring and organizing of the requirements collection process and provides a way to graphically represent the requirements.

Diff: 1 Page Ref: 13 2 What is depicted by the cardinality constraints? Answer: Cardinality constraints depict how many instances of one entity are associated with instances of another entity.

Diff: 1 Page Ref: 15 3 What is a candidate key? Answer: Candidate keys occur when an entity has more than one unique attribute. Its goal is to provide a significant level of database expertise to students. Key features include: -- Covers operational and analytical database systems. Students will learn to design and use operational and analytical databases and will be prepared to apply their knowledge in todayrsquo;s business environments.

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