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: See question 2 of https://www.geeksforgeeks.org/database-management-systems-set-8/
Quiz of this Question