Introduction to Computing MCQs with Answers
Practice important Introduction to Computing MCQs with answers and explanations.
Multiple Choice Questions
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
View Answer
B
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
View Answer
A
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
View Answer
A
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
View Answer
A
Q2225: Which operation is used to combine attributes from different relations based on a common condition?
- A: PROJECT
- B: SELECT
- C: JOIN
- D: UNION
View Answer
C
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
View Answer
A
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
View Answer
A
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
View Answer
A
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
View Answer
A
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
View Answer
A