Data Mining Online Quiz Questions And Answers

31. Relational Algebra is 
A. Data Definition Language
B. Meta Language
C. Procedural query Language
D. None of the above
Ans: C

32. Key to represent relationship between tables is called 
A. Primary key
B. Secondary Key
C. Foreign Key
D. None of these
Ans: C

33. ________ produces the relation that has attributes of Ri and R2 
A. Cartesian product
B. Difference
C. Intersection
D. Product
Ans: A

34. Which of the following are the properties of entities?
A. Groups
B. Table
C. Attributes
D. Switchboards
Ans: C

35. 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
Ans: C
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