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For the relations R and S given below:
R S
A
B
C
1
4
7
2
5
8
3
6
9
Compute
(i) ΠA,C(R) (ii) σB=2(S)
(iii) natural join (iv) outer join
(ii)
D
10
11
(iii)
(iv) Assuming left outer join
NULL
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