GATE | GATE-CS-2005 | Question 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: See question 2 of https://www.geeksforgeeks.org/database-management-systems-set-8/

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