Question: Suppose that two relations R(A, B) and S(A, B) have exactly the same schema. Consider the following equalities in relational algebra, which of the above

Suppose that two relations R(A, B) and S(A, B) have exactly the same schema. Consider the following equalities in relational algebra, which of the above equalities hold in relational algebra? Please explain why?

I. R S = R - (R - S)

II. R S = S - (S - R)

III. R S = R NATURAL-JOIN S

IV. R S = R x S

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