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21. _______ produces the relation that has attributes of R1 and R2.
Cartesian product
Difference
Intersection
Product
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22. DBMS helps achieve.
Data independence.
Centralized control of data.
Control redundancy.
All of above.
23. Which of the following are the properties of entities?
Groups
Table
Attributes
Switchboards
24. In a relation
Ordering of rows is immaterial
No two rows are identical
(A) and (B) both are true
None of these
25. It is better to use files than a DBMS when there are
Stringent real-time requirements
Multiple users wish to access the data
Complex relationships among data
All of the above.
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