There is never a good reason to use null values in a database.
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Q2: You can think of a table as
Q3: Referential and entity integrity are two names
Q4: The SELECT operator yields a vertical subset
Q6: Because the relational model uses attribute values
Q7: In a relational model,if A determines B,C,and
Q8: Character data can contain any character or
Q8: Tables within a database share common attributes
Q9: Depending on the sophistication of the application
Q17: Only a single attribute, not multiple attributes,
Q18: A null is created when you press
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