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Data Models into Database Designs Questions

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Sequential retrieval on a primary key for sequential file storage has which of the following features?


AVery fast

BModerately fast

CSlow

DImpractical

Answer: Option A

Explanation:

Here is no explanation for this answer

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Denormalization and clustering can work well to minimize data access time for small records.


ATRUE

BFALSE

Answer: Option A

Explanation:

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Relations are:


Atwo-dimensional tables.

Bthree-dimensional tables.

Cfour-dimensional tables.

Dfive-dimensional tables.

Answer: Option A

Explanation:

Here is no explanation for this answer

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When mapping a binary many-to-many relationship into a relation which of the following is TRUE?


AOne relation is created.

BTwo relations are created.

CThree relations are created.

DFour relations are created.

Answer: Option C

Explanation:

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Which of the following situation requires the use of ID-dependent entities?


AAssociation relationships only

BMultivalued attributes only

CArchetype/instance relationships only

DAll of the above use ID dependent entities

Answer: Option D

Explanation:

Here is no explanation for this answer

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The entity integrity rule states that:


Ano primary key attribute may be null.

Bno primary key can be composite

Cno primary key may be unique.

Dno primary key may be equal to a value in a foreign key.

Answer: Option A

Explanation:

Here is no explanation for this answer

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The relational model consists of:


Adata in the form of tables

Bdata redundancy.

Coperations using non-SQL languages

Dunorganized data

Answer: Option A

Explanation:

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Which is


AThey are short.

BThey are fixed.

CThey have meaning to the user.

DThey are numeric.

Answer: Option C

Explanation:

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An enterprise key is a primary key whose value is unique for a given relation.


ATRUE

BFALSE

Answer: Option B

Explanation:

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


ATRUE

BFALSE

Answer: Option A

Explanation:

Here is no explanation for this answer

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