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14. (3 p.) What is the difference between the natural join R S and the theta-join Rc S where the condition C is that R.A

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14. (3 p.) What is the difference between the natural join R S and the theta-join Rc S where the condition C is that R.A = S.A for each attribute A appearing in the schemas of both R and S? For example, if the relations are R(A, B, C, D) and S(C, D, E), what is the difference between RDS and R XR.C=S.C AND R.D=S.D S

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