Database Systems - Section 2 Multiple Questions and Answers.




26. Which of the following operation allows us to find the tuples that are in one relation but are not in another relation?
A. Set difference
B. Union
C. Cartesian product
D. Set intersection

27. Which of the following operation allows us to find the tuples that are in one relation but are not in another relation?
A. Set difference
B. Union
C. Cartesian product
D. Set intersection

28.Which of the following operation, denoted by cross (×), allows to combine the information from any two relation?
A. Set difference
B. Union
C. Cartesian product
D. Set intersection

29. Suppose we wish to find all customers who have both a loan and an account. Which of the following operation allows us to produce this relation?
A. Set difference
B. Union
C. Cartesian product
D. Set intersection or set difference

30. Which of the following operation that allows us to combine certain selections and a Cartesian product into one operation?
A. Set-intersection operation
B. Natural-Join operation
C. Division operation
D. Assignment operation

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