Compute natural join and outer join, Database Management System

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For the relations R and S given below:

R S

Compute

(i) ΠA,C(R) (ii) σB=2(S)

(iii) natural join (iv) outer join

A	C
1	3
4	6
7	9

(ii)

B	C	D
2	3	10
2	3	11

(iii)

A	B	C	D
1	2	3	10
1	2	3	11

(iv) Assuming left outer join

A	B	C	D
1	2	3	10
1	2	3	11
4	5	6	NULL
7	8	9	NULL

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