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A primary key may be null.
Options:
A
.
 True
B
.
 False
Answer: Option B
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More Questions on This Topic :
Question 1.
A null value is assigned when no other value applies.....
Question 2.
The primary key in a relation does not need to be underlined.....
Question 3.
A synonym is two or more attributes that have different names but the same meaning.....
Question 4.
In a 1:M relationship, the primary key on the one side migrates to the many side to become the foreign key on the many s....side to become the foreign key on the many side.
Question 5.
Normalization is a formal process for deciding which attributes should be grouped together in a relation.....
Question 6.
A candidate key must uniquely identify each row.....
Question 7.
Well-structured relations encourage anomalies of data.....
Question 8.
A foreign key may be null and still adhere to the referential integrity constraint.....
Question 9.
The primary key of the new relation in a many-to-many relationship is a composite key comprised of the primary keys of e....of the primary keys of each of the binary entities.
Question 10.
If a relation is in third normal form, it does not need to be in second normal form.....
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