Consider the following ORACLE relations: R(A,B,C) = {<1,2,3>, <1,2,0>, <1,3,1>, <6,2,3>, <1,4,2>,< 3,1,4>} S(B,C,D) = {<2,3,7>, <1,4,5>, <1,2,3>, <2,3,4>, <3,1,4>} Consider the following two SQL queries SQ1 and SQ2: SQ1: SELECT R.B, AVG(S.B) FROM R, S WHERE R.A = S.C AND S.D < 7 GROUP BY R.B; SQ2: SELECT DISTINCT S.B, MIN (S.C) FROM S GROUP BY S.B HAVING COUNT (DISTINCT S.D) > 1; If M is the number of tuples returned by SQ1 and N is the number of tuples returned by SQ2 then (A) M=4, N=2 (B) M=5, N=3 (C) M=2, N=2 (D) M=3, N=3

Consider the following ORACLE relations: R(A,B,C) = {<1,2,3>, <1,2,0>, <1,3,1>, <6,2,3>, <1,4,2>,< 3,1,4>} 

S(B,C,D) = {<2,3,7>, <1,4,5>, <1,2,3>, <2,3,4>, <3,1,4>}

Consider the following two SQL queries SQ1 and SQ2:

SQ1: SELECT R.B, AVG(S.B)

FROM R, S

WHERE R.A = S.C AND S.D < 7

GROUP BY R.B;

SQ2: SELECT DISTINCT S.B, MIN (S.C)

FROM S

GROUP BY S.B

HAVING COUNT (DISTINCT S.D) > 1;

If M is the number of tuples returned by SQ1 and N is the number of tuples

returned by SQ2 then

(A) M=4, N=2 (B) M=5, N=3

(C) M=2, N=2 (D) M=3, N=3
by

1 Answer

Answer :

(A) M=4, N=2 
by

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