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Data Modeling with ER Model Questions

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Choose the correct option.

Which of the following indicates the maximum number of entities that can be involved in a relationship?


AMinimum cardinality

BMaximum cardinality

CERD

DGreater Entity Count (GEC)

Answer: Option B

Explanation:

Here is no explanation for this answer

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1:1, 1:N and N:M relationships are also known as HAS-A relationships.


ATRUE

BFALSE

Answer: Option A

Explanation:

Here is no explanation for this answer

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An attribute name should be which of the following?


ASingular verb or verb phrase

BFollow a standard format

CUse a alias

DAll of the above.

Answer: Option B

Explanation:

Here is no explanation for this answer

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When designing a database, first identify the entities, then determine the attributes, and finally establish the relationships.


ATRUE

BFALSE

Answer: Option B

Explanation:

Here is no explanation for this answer

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When an entity instance must be a member of only one subtype, it is which of the following?


ADisjoint with total specialization

BDisjoint with partial specialization

COverlap with total specialization

DOverlap with partial specialization

Answer: Option A

Explanation:

Here is no explanation for this answer

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A ternary relationship is so called because in contains two entities and one association between them.


ATRUE

BFALSE

Answer: Option B

Explanation:

Here is no explanation for this answer

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Entities use identifiers while tables use keys.


ATRUE

BFALSE

Answer: Option A

Explanation:

Here is no explanation for this answer

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A time stamp is a time value that is associated with a data value.


ATRUE

BFALSE

Answer: Option A

Explanation:

Here is no explanation for this answer

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Total specialization is represented by double lines between the supertype and subtype on an EER.


ATRUE

BFALSE

Answer: Option A

Explanation:

Here is no explanation for this answer

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A good business rule is which of the following?


ADeclarative

BImprecise

CRedundant

DCompound

Answer: Option A

Explanation:

Here is no explanation for this answer

Workspace

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