Q. 76 The following table has two attributes A and C where A is the primary key and C is the foreign key referencing A with on-delete cascade.
A C ----- 2 4 3 4 4 3 5 2 7 2 9 5 6 4
The set of all tuples that must be additionally deleted to preserve referential integrity when the tuple (2,4) is deleted is:
(A) (3,4) and (6,4)
(B) (5,2) and (7,2)
(C) (5,2), (7,2) and (9,5)
(D) (3,4), (4,3) and (6,4)
Answer: (C)
Explanation:
