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Data Models into Database Designs

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 situation requires the use of ID-dependent entities?

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

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Data Models into Database Designs
In a 1:1 relationship, the primary key placement is arbitrary.

False
True

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Data Models into Database Designs
Cascading updates refers to child rows being automatically deleted when a parent row is deleted.

True
False

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Data Models into Database Designs
If a relationship has a cascade updates constraint, then if ________ in the parent table is changed, then the same change will automatically be made to any corresponding foreign key value.

a foreign key
any alternate key
the primary key
a surrogate key

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Data Models into Database Designs
When the parent entity is required, cascading updates and cascading deletions should be allowed or the associated actions on the parent should be prohibited.

False
True

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