A null value in a column may indicate that there is an appropriate value for that attribute,but it is unknown.

Name: A null value in a column may indicate that there is an appropriate value for that attribute,but it is unknown.
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A null value is often used to represent a missing or unknown value for an attribute in a database. Therefore, a null value in a column may indicate that there is an appropriate value for that attribute, but it is unknown.

A Null Value in a Column May Indicate That There