Introduction to Computing MCQs with Answers
Practice important Introduction to Computing MCQs with answers and explanations.
Chapter: 158
Q2221:
Fill in the blank: The result of the JOIN operation includes tuples from both relations where the specified condition __________.
A. Is not met
B. Is met
C. Changes periodically
D. Is irrelevant
Correct Answer:
B
Chapter: 158
Q2222:
Fill in the blank: In the statement `NEW1 <- JOIN ASSIGNMENT and JOB where ASSIGNMENT.JobId = JOB.JobId`, the JOIN is performed based on the condition that __________.
A. The JobId values in both relations are equal
B. The JobId values in ASSIGNMENT are greater than in JOB
C. The JobId values in JOB are less than in ASSIGNMENT
D. The JobId values in both relations are different
Correct Answer:
A
Chapter: 158
Q2223:
What will be the content of relation `NEW1` after executing `NEW1 <- JOIN ASSIGNMENT and JOB where ASSIGNMENT.JobId = JOB.JobId`?
A. A relation with combined attributes from ASSIGNMENT and JOB where JobId values match
B. A relation with all attributes from ASSIGNMENT and JOB, regardless of JobId values
C. A relation with only the attributes from ASSIGNMENT
D. A relation with only the attributes from JOB
Correct Answer:
A
Chapter: 158
Q2224:
Fill in the blank: The JOIN operation `NEW1 <- JOIN ASSIGNMENT and JOB where ASSIGNMENT.JobId = JOB.JobId` creates a relation with __________.
A. Matching tuples based on JobId from both ASSIGNMENT and JOB
B. Only tuples from ASSIGNMENT
C. Only tuples from JOB
D. Tuples where JobId values do not match
Correct Answer:
A
Chapter: 158
Q2225:
Which operation is used to combine attributes from different relations based on a common condition?
A. PROJECT
B. SELECT
C. JOIN
D. UNION
Correct Answer:
C
Chapter: 158
Q2226:
In the example `C <- JOIN A and B where A.W = B.X`, what will the resulting relation `C` contain?
A. Attributes from both A and B where W equals X
B. Attributes only from A where W equals X
C. Attributes only from B where X equals W
D. No attributes from either A or B
Correct Answer:
A
Chapter: 158
Q2227:
What is the final step to obtain a listing of employee IDs and their departments using the JOIN operation, as described in the content?
A. PROJECT the EmplId and Dept columns from the final relation
B. SELECT tuples where TermDate equals '*' from the final relation
C. JOIN ASSIGNMENT and JOB relations using JobId
D. SELECT the tuples where ASSIGNMENT.JobId equals JOB.JobId
Correct Answer:
A
Chapter: 159
Q2228:
What is a key feature of an object-oriented database?
A. Objects are linked to reflect their relationships
B. Objects are stored in a flat file format
C. Objects are indexed by numerical values
D. Objects are stored in a sequential manner
Correct Answer:
A
Chapter: 159
Q2229:
In an object-oriented database, what is the primary role of the DBMS regarding object links?
A. It maintains the links between objects
B. It updates the object attributes
C. It creates new object classes
D. It deletes old objects
Correct Answer:
A
Chapter: 159
Q2230:
Which of the following best describes a persistent object in an object-oriented database?
A. An object that is saved after the program terminates
B. An object that is discarded when the program terminates
C. An object that is temporary during program execution
D. An object that is not linked to any other object
Correct Answer:
A
Chapter: 159
Q2231:
In an object-oriented database, what is a major advantage of encapsulating name details within an object?
A. It allows easy handling of different name formats and structures
B. It simplifies the database schema design
C. It reduces the need for data validation
D. It minimizes storage requirements
Correct Answer:
A
Chapter: 159
Q2232:
Fill in the blank: In an object-oriented database, an employee’s job history can be retrieved by __________.
A. Asking the employee object to report its job history
B. Creating a complex query across multiple tables
C. Updating the job history manually in the database
D. Searching through a log file for job assignments
Correct Answer:
A
Chapter: 159
Q2233:
Which database paradigm allows for storing intelligent objects with methods for handling data?
A. Relational database
B. Object-oriented database
C. Flat-file database
D. Hierarchical database
Correct Answer:
B
Chapter: 159
Q2234:
What problem is addressed by using intelligent objects in an object-oriented database?
A. The need for specific data handling methods and interactions
B. Managing large datasets efficiently
C. Standardizing data types across the database
D. Reducing data redundancy
Correct Answer:
B
Chapter: 159
Q2235:
Fill in the blank: An object-oriented database avoids the problem of __________ when dealing with multimedia data.
A. Handling new data types within existing functions
B. Fragmentation of data across different tables
C. Overhead of multiple indexes
D. Scalability issues with large datasets
Correct Answer:
A
Chapter: 159
Q2236:
Which of the following is an advantage of object-oriented databases over relational databases?
A. Support for multimedia and intelligent objects
B. More efficient querying of large datasets
C. Better performance for simple data retrieval
D. Automatic normalization of data
Correct Answer:
C
Chapter: 159
Q2237:
What is the main benefit of having objects linked in an object-oriented database?
A. It reflects the relationships between different objects
B. Improves the speed of data retrieval
C. Reduces the complexity of database queries
D. Ensures data integrity across multiple tables
Correct Answer:
A
Chapter: 159
Q2238:
Fill in the blank: In an object-oriented database, the approach to storing names as intelligent objects helps in __________.
A. Providing flexible handling of names in various formats
B. Reducing the amount of data stored
C. Improving the speed of database access
D. Standardizing name formats across the system
Correct Answer:
A
Chapter: 160
Q2239:
What is the primary concern for maintaining database integrity in large, multiuser commercial systems?
A. Shielding users from technical details
B. Minimizing the inconvenience of errors
C. Cost of incorrect or lost data
D. Reducing the size of the database
Correct Answer:
C
Chapter: 160
Q2240:
Which type of database system typically focuses on shielding users from technical details?
A. Personal use database systems
B. Commercial multiuser database systems
C. Cloud-based database systems
D. Open-source database systems
Correct Answer:
A