A null is created when you press the Enter key or the Tab key to move to the next entry without making a prior entry of any kind.
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Q13: The practical significance of taking the logical
Q14: The DIFFERENCE operator subtracts one table from
Q15: A data dictionary is sometimes described as
Q16: If the attribute (B) is functionally dependent
Q17: Only a single attribute, not multiple attributes,
Q19: The one-to-many (1:M) relationship is easily implemented
Q20: The order of the rows and columns
Q21: _ are especially useful when you are
Q22: _, also known as RESTRICT, yields values
Q23: When two or more tables share the
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