The ___________ operation, denoted by −, allows us to find tuples that are in one relation but are not in another.
A. Union
B. Set-difference
C. Difference
D. Intersection
Answer:A
The ___________ operation, denoted by −, allows us to find tuples that are in one relation but are not in another.
A. Union B. Set-difference C. Difference D. Intersection
Explanation:The expression r − s produces a relation containing those tuples in r but not in s.