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Data Models into Database Designs

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

Default value
Data type
Null status
Data constraints

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Data Models into Database Designs
When the parent entity is required, a new child row can always be inserted.

True
False

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Data Models into Database Designs
A foreign key is:

All of these
used to define data types.
a column containing the primary key of another table.
used to define null status.

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Data Models into Database Designs
A unique, DBMS-supplied identifier used as the primary key of a relation is called a(n):

surrogate key.
foreign key.
composite key.
primary key.

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Data Models into Database Designs
All primary keys are required.

False
True

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Data Models into Database Designs
When the parent entity is required, a new parent row can always be inserted.

False
True

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