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Database - Logical Database Design

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Exercise : Logical Database Design - General Questions
1.
The entity integrity rule states that:
no primary key attribute may be null.
no primary key can be composite.
no primary key may be unique.
no primary key may be equal to a value in a foreign key.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
2.
When mapping a many-to-many unary relationship into a relation which of the following is true?
One relation is created.
Two relations are created.
Three relations are created.
Four relations are created.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
3.
If no multivalued attributes exist and no partial dependencies exist in a relation, then the relation is in what normal form?
First normal form
Second normal form
Third normal form
Fourth normal form
Answer: Option
Explanation:
No answer description is available. Let's discuss.
4.
A foreign key is which of the following?
Any attribute
The same thing as a primary key
An attribute that serves as the primary key of another relation
An attribute that serves no purpose
Answer: Option
Explanation:
No answer description is available. Let's discuss.
5.
A transitive dependency is which of the following?
A functional dependency between two or more key attributes.
A functional dependency between two or more nonkey attributes.
A relation that is in first normal form.
A relation that is in second normal form.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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