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B Ad-hoc query capability is limited C Objects are table-centric D Neither relational purists nor object purists are enamored with this combination E Object applications are not as data-centric as relational ones 20 When considering the selection of a database model, which of the following facts
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A Ordinary file system files can handle simple data, provided there are no ad-hoc
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B Relational databases can handle simple data that has ad-hoc query requirements C Object-oriented databases are best at handling complex data D Object-relational databases can handle complex data that has ad-hoc query
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E Object-oriented databases can handle complex data, provided there are no ad-hoc
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Part
Appendices
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Appendix
Answers to Self Tests
Databases: A Beginner s Guide
1: Database Fundamentals
1 The logical layer of the ANSI/SPARC model provides which of the following
A Physical data independence B Parent-child relationships C Logical data independence D Encapsulation A is the correct answer
2 The external layer of the ANSI/SPARC model provides which of the following
A Physical data independence B Parent-child relationships C Logical data independence D Encapsulation C is the correct answer
3 Which of the following is not true regarding user views
A Application programs reference them B People querying the database reference them C They can be tailored to the needs of the database user D Data updates are shown in a delayed fashion D is the correct answer
4 The database schema is contained in the ____________ layer of the ANSI/SPARC model
logical
5 User views are contained in the ____________ layer of the ANSI/SPARC model
external
6 When application programs use flat file systems, where do the file definitions reside
In the application programs
7 Which of the following is true regarding the hierarchical database model
A It was first developed by Peter Chen B Data and methods are stored together in the database
Appendix A: Answers to Self Tests
C Each node may have many parents D Records are connected using physical address pointers D is the correct answer
8 Which of the following is true regarding the network database model
A It was first developed by EF Codd B Data and methods are stored together in the database C Each node may have many parents D Records are connected using common physical address pointers C and D are correct answers
9 Which of the following is true of the relational database model
A It was first developed by Charles Bachman B Data and methods are stored together in the database C Records are connected using physical address pointers D Records are connected using common data items in each record D is the correct answer
10 Which of the following is true regarding the object-oriented model
A It was first developed by Charles Bachman B Data and methods are stored together in the database C Data is presented as two-dimensional tables D Records are connected using common data items in each record B is the correct answer
11 Which of the following is true regarding the object-relational model
A It serves only a niche market and most experts believe it will stay that way B Records are connected using physical address pointers C It was developed by adding object-like properties to the relational model D It was developed by adding relational-like properties to the object-oriented model C is the correct answer
12 According to advocates of the relational model, which of the following describe the problems
with the CODASYL model A It is too mathematical B It is too complicated
Databases: A Beginner s Guide
C Set-oriented queries are too difficult D It has no formal underpinnings in mathematical theory B, C, and D are correct answers
13 According to advocates of the CODASYL model, which of the following describe the problems
with the relational model A It is too mathematical B Set-oriented queries are too difficult C Application systems need record-at-a-time processing D It is less efficient than CODASYL model databases A, C, and D are correct answers
14 The ability to add a new object to a database without disrupting existing processes is an
example of ____________ logical data independence
15 The property that most distinguishes a relational database table from a spreadsheet is the
ability to present multiple users with their own ____________ views of the data
2: Exploring Relational Database Components
1 Examples of an entity are
A A customer B A customer order C An employee s paycheck D A customer s name A, B, and C are correct answers
2 Examples of an attribute are
A An employee B An employee s name C An employee s paycheck D An alphabetical listing of employees B is the correct answer
Appendix A: Answers to Self Tests
3 Which of the following denotes the cardinality of zero, one, or more on a relationship line
A A perpendicular tick mark near the end of the line and a crow s foot at the line end B A circle near the end of the line and a crow s foot at the end of the line C Two perpendicular tick marks near the end of the line D A circle and a perpendicular tick mark near the end of the line B is the correct answer
4 Valid types of relationships in a relational database are
A One-to-many B None-to-many C Many-to-many D One-to-one A, C, and D are correct answers
5 If a product can be manufactured in many plants, and a plant can manufacture many products,
this is an example of which type of relationship A One-to-one B One-to-many C Many-to-many D Recursive C is the correct answer
6 Which of the following are examples of recursive relationships
A An organizational unit made up of departments B An employee who manages other employees C An employee who manages a department D An employee who has many dependents B is the correct answer
7 Examples of a business rule are
A A referential constraint must refer to the primary key of the parent table B An employee must be at least 18 years old C A database query eliminates columns an employee should not see D Employees below pay grade 6 are not permitted to modify orders B and D are correct answers
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