Q. 50 Consider a relation geq which represents “greater than or equal to”, that is, (x,y) ∈ geq only if y >= x.
create table geq ( ib integer not null ub integer not null primary key 1b foreign key (ub) references geq on delete cascade )
Which of the following is possible if a tuple (x,y) is deleted?
(A) A tuple (z,w) with z > y is deleted
(B) A tuple (z,w) with z > x is deleted
(C) A tuple (z,w) with w < x is deleted
(D) The deletion of (x,y) is prohibited
Answer: (C)
Explanation:
