Discussion
Which of the following column properties specifies whether or not cells in a column must contain a data value?
Answer: A
Correct answer: Null status
Null status states whether a column may be left empty. It is one of the four column properties, alongside the data type, which says what kind of value may be stored; the default value, which says what to store if none is supplied; and the data constraints, which limit which values are acceptable.
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