1.

Suppose database table T1(P, R) currently has tuples {(10, 5), (15, 8), (25, 6)} and table T2 (A, C) currently has {(10, 6), (25, 3), (10, 5)}. Consider the following three relational algebra queries RA1, RA2 and RA3. The number of tuples in the resulting table of RA1, RA2 and RA3 are given by:

A. 2, 4, 2 respectively
B. 2, 3, 2 respectively
C. 3, 3, 1 respectively
D. 3, 4, 1 respectively
Answer» E.


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