An object type is a user-defined composite data type.
The attributes of an object type can be those of other object types.
A PL/SQL table of records is an example of a nested object type.
An object type must be declared as a type before the actual object itself can be declared.
第1题:
A.
B.
C.
D.
第2题:
第3题:
●Which of the following statements about object oriented database is not correct? (72) .
(72) A.Each object has a unique object identify in the system
B.Encapsulation and inheritance are two important features of object oriented database
C.A subclass can inherit the attributes and methods of all its superclasses
D.A supereloss includes the attributes and methods at all subclasses
第4题:
The accounting manager wants you to create a form that when queried will display a calculated total of year-to-date actual expenditures for the found code entered. The values needed to generate this summary data are stored in multiple tables. Which data source type can you assign to the data block for this form without having the DBA create a database object?()
第5题:
You work as an application developer at Certkiller .com. You are developing an application that makes use of a Queue class object named MyQueue. This Queue class object will be used to store messages sent by the user during application run time. The application that you are developing provides an interface for administrators and an interface for users to create message reports.You want to ensure that all user messages stored in the MyQueue object are removed when an administrator selects the reset option.What should you do?()
第6题:
第7题:
You are using Recovery wizard for performing incomplete recovery. Which of the following object types is NOT available in the Perform Recovery :Type screen?()
第8题:
Which of the following statements about object oriented databse is not correct?
A. Each object has a unique object identity in the system.
B.Encapsulation and inheritance are two important features of object oriented databasE.
C.A subclass can inherit the attributes and methods of all its superclasses.
D.A subclass includes the attributes and methods of all its subclasses.
第9题:
Which three statements concerning the use of the java.io.Serializable interface are true?()
第10题:
An administrator wants to delete an account object using the Database Cleanup utility. Which of the following is the correct syntax to perform this task?()