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Logical Database Design

Logical Database Design
Relations are:

two-dimensional tables.
three-dimensional tables.
five-dimensional tables.
four-dimensional tables.

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Logical Database Design
The primary key in a relation does not need to be underlined.

True
False

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

True
False

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Logical Database Design
When mapping a regular entity 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.

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Logical Database Design
The entity integrity rule states that:

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

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

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

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