Logical Database Design - General Questions

1.

Relations are:

A.	two-dimensional tables.
B.	three-dimensional tables.
C.	four-dimensional tables.
D.	five-dimensional tables.

Answer: Option A

Explanation:

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2.

When mapping a supertype/subtype relationship which of the following is true?

A.	The supertype primary key is assigned to each subtype.
B.	The subtype primary key is assigned to each supertype.
C.	There is no link between the supertype/subtype entities.
D.	There is no primary key/foreign key relationship between a supertype/subtype.

Answer: Option A

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3.

When mapping a regular entity into a relation which of the following is true?

A.	One relation is created.
B.	Two relations are created.
C.	Three relations are created.
D.	Four relations are created.

Answer: Option A

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4.

When mapping a ternary relationship with an associative entity into a relation which of the following is true?

A.	One relation is created.
B.	Two relations are created.
C.	Three relations are created.
D.	Four relations are created.

Answer: Option D

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5.

A relation has which of the following properties?

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

Answer: Option C

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6.

vWhen mapping a binary many-to-many relationship into a relation which of the following is true?

A.	One relation is created.
B.	Two relations are created.
C.	Three relations are created.
D.	Four relations are created.

Answer: Option C

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7.

The relational model consists of:

A.	data in the form of tables.
B.	data redundancy.
C.	operations using non-SQL languages.
D.	unorganized data.

Answer: Option A

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8.

A primary key is which of the following?

A.	Any attribute
B.	An attribute that uniquely identifies each row
C.	An attribute that uniquely identifies each column
D.	A derived attribute

Answer: Option B

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