Data Models into Database Designs - General Questions (3)

17.

A primary key should be defined as:

A.	NULL.
B.	NOT NULL.
C.	Either of the above can be used.
D.	None of the above are correct.

Answer: Option B

Explanation:

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18.

Which of the following column properties specifies whether or not cells in a column must contain a data value?

A.	Null status
B.	Data type
C.	Default value
D.	Data constraints

Answer: Option A

Explanation:

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19.

In a 1:N relationship, the foreign key is placed in:

A.	either table without specifying parent and child tables.
B.	the parent table.
C.	the child table.
D.	either the parent table or the child table.

Answer: Option C

Explanation:

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20.

Which of the following data constraints would be used to specify that the value of cells in a column must be one of a specific set of possible values?

A.	A domain constraint
B.	A range constraint
C.	An intrarelation constraint
D.	An interrelation constraint

Answer: Option A

Explanation:

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Data Models into Database Designs - General Questions (3)

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