To be considered a composite key,a key must contain at least two attributes.
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Q12: In the relational model,each row of a
Q13: A key that contains more than one
Q14: While the relational model for databases appears
Q15: Which of the following is true about
Q17: Every cell in a relation can hold
Q18: Null values can cause problems because they
Q19: Which of the following terms is synonymous
Q20: The primary key is used both to
Q21: Given the functional dependency for the attributes
Q96: Explain the terms relation,tuple,and attribute.
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