Question

SWAYAM system wants to make Registration number of students a kind of key in the
ENROLLED relation such that Registration number cannot have any duplicate entry or a null
value but other relations may be connected to ENROLLED relation through this attribute.
Which type of key is the attribute Registration
number?
a) UNIQUE key
b) NOT NULL key
c) COMPOUND key
d) FOREIGN key​

Answer 1

Answer:

a unique key combination

Explanation:

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