Answer (Choose 1 answer)
The table Arc(x,y) currently has the following tuples (note that there are duplicates): (1,2), (1(3,4), (4, 1), (4, 1), (4, 1), (4,2). Compute the result of the query:
SELECT a1.x, a2.y, COUNT(*)FROM Arc a1, Arc a2 WHERE a1.y = a2.x GROUP BY a1.x, a2.y;
Which of the following tuples is in the result?
A. (3,1,6)
B. (1,3,4)
C. (2,4,6)
D. (3,2,6)
Ε. (3,1,2)
Exit (41
