91. | Which of the following is true concerning the following statement: class Manager extends Employee |
a. | Manager is a concrete class and a superclass. |
b. | Manager is a concrete class and a subclass. |
c. | Manager is an abstract class and a superclass. |
d. | Manager is an abstract class and a subclass. |
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Answer: (b).Manager is a concrete class and a subclass.
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92. | The reserved word enum is used for which of the following? |
a. | To define a range for an attribute. |
b. | To define a range for a class. |
c. | To define a range for a relationship. |
d. | All of the above. |
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Answer: (a).To define a range for an attribute.
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93. | ODL supports which of the following types of association relationships? |
a. | Unary |
b. | Unary and Binary |
c. | Unary and Binary and Ternary |
d. | Unary and Binary and Ternary and higher |
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Answer: (b).Unary and Binary
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94. | An atomic literal is which of the following? |
a. | Strings |
b. | Boolean |
c. | Long |
d. | All of the above. |
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Answer: (d).All of the above.
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95. | The keyword "inverse" is used in which of the following? |
a. | Class |
b. | Attribute |
c. | Relationship |
d. | All of the above. |
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Answer: (c).Relationship
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96. | An extent is which of the following? |
a. | A keyword that indicates that the subclass inherits from a superclass |
b. | A keyword that indicates that the superclass inherits from a subclass |
c. | The set of all instances of a class within a database |
d. | Only one instance of a class within a database |
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Answer: (c).The set of all instances of a class within a database
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97. | Which of the following is true concerning an ODBMS? |
a. | They have the ability to store complex data types on the Web. |
b. | They are overtaking RDBMS for all applications. |
c. | They are most useful for traditional, two-dimensional database table applications. |
d. | Both a and c |
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Answer: (d).Both a and c
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98. | Which of the following is not a logical data-base structure? |
a. | tree |
b. | relational |
c. | network |
d. | chain |
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Answer: (d).chain
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99. | The relational model uses some unfamiliar terminology. A tuple is equivalent to a: |
a. | record |
b. | field |
c. | file |
d. | data base |
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Answer: (a).record
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100. | A top-to-bottom relationship among the items in a database is established by a |
a. | Hierarchical schema |
b. | Network schema |
c. | Relational schema |
d. | All of the above |
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Answer: (a).Hierarchical schema
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