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- Question
An extent is which of the following?
Options- 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
- Correct Answer
- The set of all instances of a class within a database
- 1. Which of the following is true concerning the following statement: class Manager extends Employee
Options- 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. Discuss
- 2. Identify the class name for the following code: ABC123 course();
Options- A. ABC123
- B. course
- C. course()
- D. All of the above. Discuss
- 3. The object definition language (ODL) is which of the following?
Options- A. Used to develop logical schemas
- B. A data definition language for OODB
- C. A method to implement a logical schema
- D. All of the above. Discuss
- 4. An atomic literal is which of the following?
Options- A. Strings
- B. Boolean
- C. Long
- D. All of the above. Discuss
- 5. The Object Query Language is which of the following"?
Options- A. Similar to SQL and uses a select-from-where structure
- B. Similar to SQL and uses a select-where structure
- C. Similar to SQL and uses a from-where structure
- D. Not similar to SQL Discuss
- 6. Which of the following is true concerning an ODBMS?
Options- 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. All of the above. Discuss
- 7. ODL supports which of the following types of association relationships?
Options- A. Unary
- B. Unary and Binary
- C. Unary and Binary and Ternary
- D. Unary and Binary and Ternary and higher Discuss
- 8. Using ODL, you can define which of the following?
Options- A. Attribute
- B. Structure
- C. Operation
- D. All of the above. Discuss
- 9. A view is which of the following?
Options- A. A virtual table that can be accessed via SQL commands
- B. A virtual table that cannot be accessed via SQL commands
- C. A base table that can be accessed via SQL commands
- D. A base table that cannot be accessed via SQL commands Discuss
- 10. In an SQL SELECT statement querying a single table, according to the SQL-92 standard the asterisk (*) means that:
Options- A. all columns of the table are to be returned.
- B. all records meeting the full criteria are to be returned.
- C. all records with even partial criteria met are to be returned.
- D. None of the above is correct. Discuss
Object-Oriented Database problems
Search Results
Correct Answer: Manager is a concrete class and a subclass.
Correct Answer: ABC123
Correct Answer: All of the above.
Correct Answer: All of the above.
Correct Answer: Similar to SQL and uses a select-from-where structure
Correct Answer: They have the ability to store complex data types on the Web.
Correct Answer: Unary and Binary
Correct Answer: All of the above.
Correct Answer: A virtual table that can be accessed via SQL commands
Correct Answer: all columns of the table are to be returned.
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