Question: A NULL value in an attribute could mean the following, except _ _ _ _ _ _ _ _ _ _ . Question 5 options:

A NULL value in an attribute could mean the following, except __________.
Question 5 options:
The value is a predicate.
The value exists but is not available.
The value is not known.
The value does not apply for this particular row.
A row is identifiable by a unique combination of attributes.
Question 7 options:
Entity integrity
Referential integrity
Domain integrity
General integrity
An attribute cannot contain a value outside its defined data type.
Question 8 options:
Entity integrity
Referential integrity
Domain integrity
General integrity

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