Exam 4: Relational Databases

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In the Customer table above,"Customer #" is best described as

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The logical view of a database system refers to

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Identify the statement below that is false with regards to basic requirements of a relational database model.

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Which of the following would not be found in a data dictionary entry for a data item?

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Databases were originally developed to address which problem?

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In a well-structured database,the constraint that ensures the consistency of the data is known as the

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In a relational database,requiring that every record in a table have a unique identifier is called the

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The database requirement that foreign keys must be null or have a value corresponding to the value of a primary key in another table is formally called the

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Inability to add new data to a database without violating the basic integrity of the database is referred to as the

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Tom Wilson is chairman of the Rare Car Club,where he maintains a database of registered rare cars and their history.One table will store the model,make,vehicle identification number,and other characteristics of all of the registered rare cars.Each rare car is uniquely identified by a registration number.A second table will contain data that link each rare car to its most recent estimated fair market value by means of their registration numbers.The entities described by the first table are

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The physical view of a database system refers to

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Explain the two advantages semantic data modeling has over normalization when designing a relational database.

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Emma Kolb is a system analyst at a manufacturing company located in the Midwest.She has been asked to analyze the company's accounting information system and to recommend cost-effective improvements.After noting that the several key managers do not have access to the production and sales information,she recommends that they should be uploaded to the company's internal network and be made available for search.Implementation of her recommendation would benefit the company by contributing to

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A fully normalized database is called

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A set of individual user views of the database is called the

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Mary Lamb is an insurance sales representative.Her company has provided her with a laptop computer that uses wireless connectivity to access the accounting information system from virtually anywhere in the country.She has access to view customer and insurance product information.She also has access that allows her to enter and cancel customer orders.The permissions for Mary (and other sales reps)define a ________ in the company's database management system.

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Describe the information that is contained in the data dictionary.

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What acts as an interface between the database and the various application programs?

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Pat Owen is chair of the National Grizzly Society,which maintains a database of all grizzly bears within the United States.One table will store the name,birth date,and other characteristics of all of the grizzly bears that have been registered.Each grizzly bear is uniquely identified by a registration number.A second table will contain data that link each grizzly bear to its male and female parents by means of their registration numbers.The entities described by the second table are

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Describe the reason why it is acceptable to have null foreign key,but it is unacceptable to have a null primary key.Use the concept of entity integrity rule and referential integrity rule in your answer.

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