| 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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