Computers and Technology, 27.11.2019 02:31 alasiaca

R(a, b) currently contains the four tuples (0,4), (1,5), (2,4), and (3,5). s(c, d) currently contains the four tuples (2,10), (3,11), (4,12), and (5,13). as a result, certain insertions and deletions on s are illegal, as are certain updates or insertions on r. you should develop simple tests for illegal operations of these four kinds. then, show your understanding by indicating which of the following modifications will not be rejected because of a constraint violation.

a) inserting (5,0) into r.
b) inserting (1,4) into r.
c) updating (2,4) in r to be (2,2).
d) updating (3,5) in r to be (3,1).

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R(a, b) currently contains the four tuples (0,4), (1,5), (2,4), and (3,5). s(c, d) currently contain...

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