A proper understanding of the concept and use of keys in a relational database model is very important.
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Q1: There is never a good reason to
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
Q13: The practical significance of taking the logical
Q14: Numeric data are data on which you
Q17: Only a single attribute, not multiple attributes,
Q20: The order of the rows and columns
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