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Frage 1
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21. A(n) _________’s main function is to help one understand the complexities of the realworld environment.
Antworten
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A. node
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b. entity
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c. model
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d. database
Frage 2
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22. A(n) ____________ represents a particular type of object in the real world.
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a. attribute
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b. entity
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c. relationship
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d. node
Frage 3
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23. A(n) __________ is anything about which data are to be collected and stored.
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a. attribute
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b. entity
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c. relationship
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d. constraint
Frage 4
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24. A(n) ___________ is the equivalent of a field in a file system.
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a. attribute
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b. entity
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c. relationship
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d. constraint
Frage 5
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25. A(n) _________ is bidirectional.
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a. attribute
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b. entity
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c. relationship
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d. constraint
Frage 6
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26. A(n) _________ is a restriction placed on the data.
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a. attribute
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b. entity
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c. relationship
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d. constraint
Frage 7
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27. ________ are important because they help to ensure data integrity.
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a. Attributes
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b. Entities
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c. Relationships
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d. Constraints
Frage 8
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28. ________ are normally expressed in the form of rules.
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a. Attribtues
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b. Entities
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c. Relationships
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d. Constraints
Frage 9
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29. Students and classes have a ____________ relationship.
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a. one-to-one
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b. one-to-many
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c. many-to-one
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d. many-to-many
Frage 10
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Business rules are derived from ____.
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a.a detailed description of an organization’s operations
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b.standards and practices developed over the years
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c.managers’ recommendations
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d.governmental oversight organization standards
Frage 11
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31. Which of the following is true of business rules?
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a. They allow the designer to set company policies with regard to data.
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b. They allow the designer to develop business processes.
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c. They can serve as a communication tool between the users and designers.
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d. They provide a framework for the company’s self-actualization.
Frage 12
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32. A noun in a business rule translates to a(n) __________ in the data model.
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a. entity
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b. attribute
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c. relationship
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d. constraint
Frage 13
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33. A verb associating two nouns in a business rule translates to a(n) __________ in the data model.
Antworten
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a. entity
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b. attribute
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c. relationship
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d. constraint
Frage 14
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34. The hierarchical data model was developed in the __________.
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a. 1960s
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b. 1970s
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c. 1980s
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d. 1990s
Frage 15
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35. The object-oriented data model was developed in the ____________.
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a. 1960s
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b. 1970s
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c. 1980s
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d. 1990s
Frage 16
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36. VMS/VSAM is an example of the ___________.
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a. hierarchical model
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b. file system data model
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c. relational data model
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d. XML data model
Frage 17
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37. Oracle 11g is an example of the ___________.
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a. hierarchical model
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b. file system data model
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c. relational data model
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d. XML/Hybrid data model
Frage 18
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38. MySQL is an example of the ________.
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a. hierarchical model
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b. file system data model
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c. relational data model
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d. XML data model
Frage 19
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39. In the ________ model, the basic logical structure is represented as an upside-down tree.
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a. hierarchical
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b. network
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c. relational
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d. entity relationship
Frage 20
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40. In the __________ model, each parent can have many children, but each child has only one parent.
Antworten
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a. hierarchical
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b. network
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c. relational
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d. entity relationship
Frage 21
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41. The relational data model was developed in the _________.
Antworten
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a. 1960s
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b. 1970s
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c. 1980s
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d. 1990s
Frage 22
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42. In the _______ model, the user perceives the database as a collection of records in 1:M relationships, where each record can have more than one parent.
Antworten
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a. hierarchical
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b. network
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c. object-orientated
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d. entity relationship
Frage 23
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44. A(n) ________ enables a database administrator to describe schema components.
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a. extensible markup language (XML)
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b. data definition language (DDL)
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c. unified modeling language (UML)
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d. query langauge
Frage 24
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24.The ____ model was developed to allow designers to use a graphical tool to
examine structures rather than describing them with text.
Antworten
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a. hierarchial
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b. network
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c. object-oriented
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d. entity relationship
Frage 25
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49. The ________ model uses the term connectivity to label the relationship types.
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a. relational
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b. network
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c. object-oriented
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d. entity relationship
Frage 26
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51. The _________ data model is said to be a semantic data model.
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a. relational
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b. network
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c. object-oriented
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d. entity relationship
Frage 27
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52. The ________ data model uses the concept of inheritance.
Antworten
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a. relational
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b. network
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c. object-oriented
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d. entity relationship
Frage 28
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53. One of the limitations of the ________ model is that there is a lack of standards.
Antworten
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a. hierarchical
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b. network
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c. relational
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d. entity relationship
Frage 29
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54. The ________ model is the end users’ view of the data environment.
Antworten
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a. abstract
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b. external
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c. conceptual
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d. internal
Frage 30
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30.A(n) ____ model represents a global view of the database as viewed by the entire
organization.
Antworten
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a. external
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b. conceptual
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c. internal
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d. physical
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