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Logical Database Design

Logical Database Design
Normalization is a formal process for deciding which attributes should be grouped together in a relation.

True
False

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Logical Database Design
The entity integrity rule states that:

no primary key attribute may be null.
no primary key may be equal to a value in a foreign key.
no primary key can be composite.
no primary key may be unique.

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Logical Database Design
A relation has which of the following properties?

Each row is not unique.
Attributes can have the same name within a given table.
The order of the columns is significant.
Each relation has a unique name.

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Logical Database Design
A foreign key may be null and still adhere to the referential integrity constraint.

False
True

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Logical Database Design
When mapping a binary many-to-many relationship into a relation which of the following is true?

Three relations are created.
Four relations are created.
Two relations are created.
One relation is created.

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Logical Database Design
A synonym is two or more attributes that have different names but the same meaning.

True
False

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