To avoid nulls, some designers use special codes, known as _____, to indicate the absence of some value.
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Q47: In a relational table, each column has
Q48: _ is the real power behind the
Q49: A table is also called a(n) _
Q50: In a database context, a(n) _ indicates
Q51: A(n) _ is an orderly arrangement used
Q53: The relational operators have the property of
Q54: PRODUCT yields all possible pairs of rows
Q55: A(n) _ provides a detailed description of
Q56: The _ relationship should be rare in
Q57: According to Codd's _ rule of relational
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