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Data Models into Database Designs

Data Models into Database Designs
Which constraint requires that the binary relationship indicate all combinations that must appear in the ternary relationship?

MUST COVER
Both of the above
None of these
MUST NOT

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Data Models into Database Designs
Which of the following data constraints would be used to specify that the value of a cell in one column must be less than the value of a cell in another column in the same row of the same table?

A domain constraint
An interrelation constraint
A range constraint
An intrarelation constraint

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Data Models into Database Designs
An ideal primary key is short, numeric and seldom changing.

True
False

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Data Models into Database Designs
Which of the following column properties specifies whether or not cells in a column must contain a data value?

Data constraints
Default value
Data type
Null status

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Data Models into Database Designs
The terms alternate key and candidate key mean the same thing.

False
True

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Data Models into Database Designs
Which of the following situation requires the use of ID-dependent entities?

Multivalued attributes only
Association relationships only
All of these
Archetype/instance relationships only

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