Database MCQ - ER-model & Relational Model

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21:  

_______ produces the relation that has attributes of R1 and R2

A.	Cartesian product
B.	Difference
C.	Intersection
D.	Product
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	Option: A Explanation : Click on Discuss to view users comments. Write your comments here: Updating your Comments.. Updating your Comments..

22:  

DBMS helps achieve

A.	Data independence
B.	Centralized control of data
C.	Control redundancy
D.	All of above
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	Option: D Explanation : Click on Discuss to view users comments. Write your comments here: Updating your Comments.. Updating your Comments..

23:  

Which of the following are the properties of entities?

A.	Groups
B.	Table
C.	Attributes
D.	Switchboards
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	Option: C Explanation : Click on Discuss to view users comments. Write your comments here: Updating your Comments.. Updating your Comments..

24:  

 In a relation

A.	Ordering of rows is immaterial
B.	No two rows are identical
C.	(A) and (B) both are true
D.	None of these
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	Option: C Explanation : Click on Discuss to view users comments. Write your comments here: Updating your Comments.. Updating your Comments..

25:  

It is better to use files than a DBMS when there are

A.	Stringent real-time requirements
B.	Multiple users wish to access the data
C.	Complex relationships among data
D.	All of the above.
	Answer Report Discuss
	Option: B Explanation : Click on Discuss to view users comments. md ilyas said: (6:51pm on Wednesday 25th February 2015) multiple access is possible in dbms Write your comments here: Updating your Comments.. Updating your Comments..

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