The following table has two attributes A and C where A is the primary key and…
GATE · 2005 · CS
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 4The 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)
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