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Given two relational schemas R(ABC) and S(ABC) , let r(R) and s(S) be the relations (relation table or relation instance) corresponding to R and S
Given two relational schemas R(ABC) and S(ABC), let r(R) and s(S) be the relations (relation table or relation instance) corresponding to R and S respectively as the following:
R
A | B | C |
a1 | b1 | c1 |
a2 | b2 | c2 |
S
A | B | C |
a1 | b1 | c1 |
a3 | b3 | c3 |
Please indicate if the following expression is True or False.
1) ; R n S = (R u S) - (( R - S ) u (S - R))
2) ;
Given relation schema R(A,B,C) and S(C,D,E), please indicate if the following expression is True or False.
3) R semi-join S equivalent to S semi-join R
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