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Chapter 6

Chapter 6. 1. A grouping of characters into a word, a group of words, or a complete number is called a record. Answer: FALSE. 2. Each characteristic or quality describing a particular entity is called an attribute. Answer: TRUE. 3.

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Chapter 6

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  1. Chapter 6

  2. 1 • A grouping of characters into a word, a group of words, or a complete number is called a record. • Answer: FALSE

  3. 2 • Each characteristic or quality describing a particular entity is called an attribute. • Answer: TRUE

  4. 3 • Program-data dependencerefers to the coupling of data stored in files and software programs that use this data such that changes in programs require changes to the data. • Answer: TRUE

  5. 4 • A DBMS separates the logical and physical views of the data. • Answer: TRUE

  6. 5 • Every record in a file should contain at least one key field. • Answer: TRUE

  7. 6 • Many applications today require databases that can store and retrieve multimedia. • Answer: TRUE

  8. 7 • One of the drawbacks to OODBMS are that they cannot work with applets. • Answer: FALSE

  9. 8 • Which of the following is NOT one of the main problems with a traditional file environment? • A) data inconsistency • B) program-data independence • C) lack of flexibility in creating ad-hoc reports • D) poor security • Answer: B

  10. 9 • A DBMS reduces data redundancy and inconsistency by • A) enforcing referential integrity. • B) uncoupling program and data. • C) utilizing a data dictionary. • D) minimizing isolated files with repeated data. • Answer: D

  11. 10 • Which of the following best illustrates the relationship between entities and attributes? • A) the entity CUSTOMER with the attribute PRODUCT • B) the entity CUSTOMER with the attribute PURCHASE • C) the entity PRODUCT with the attribute PURCHASE • D) the entity PRODUCT with the attribute CUSTOMER • Answer: B

  12. 11 • A characteristic or quality describing an entity is called a(n) • A) field. • B) tuple. • C) key field. • D) attribute. • Answer: D

  13. 12 • Which of the following non-digital data storage items is most similar to a database? • A) library card catalog. • B) cash register receipt. • C) doctor's office invoice. • D) list of sales totals on a spreadsheet. • Answer: A

  14. 13 • The confusion created by ________ makes it difficult for companies to create customer relationship management, supply chain management, or enterprise systems that integrate data from different sources. • A) batch processing • B) data redundancy • C) data independence • D) online processing • Answer: B

  15. 14 • Duplicate data in multiple data files is called data ________. • A) redundancy • B) repetition • C) independence • D) partitions • Answer: A

  16. 15 • The logical view • A) shows how data are organized and structured on the storage media. • B) presents an entry screen to the user. • C) allows the creation of supplementary reports. • D) presents data as they would be perceived by end users. • Answer: D

  17. 16 • In a relational database, the three basic operations used to develop useful sets of data are • A) select, project, and where. • B) select, join, and where. • C) select, project, and join. • D) select, from, and join. • Answer: C

  18. 17 • Databases record information about general categories of information referred to as ________. • Answer: entities

  19. 18 • Data ________ describes a situation in which the same attribute of a data entity may have different values. • Answer: inconsistency

  20. 19 • A(n) ________ view shows data as it is actually organized and structured on the data storage media. • Answer: physical

  21. 20 • DBMS have a(n) ________ capability to specify the structure of the content of the database. • Answer: data definition

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