Question: Let r ( R ) and s ( S ) be relations. If R S is a key for neither R nor S and R

Let r(R) and s(S) be relations. If RS is a key for neither R nor S and RS=A.nr and ns are number of
tuples in relation r and s, respectively. V(A,r) and V(A,s) are the number of distinct values that appear
for attribute A in r and s, respectively. Then what is the estimated number of tuples in
r|>|s?
Let r(R) and s(S) be relations. If RS is a key

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