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Which of the following conditions will make a relation that is in first normal form. to be in second normal form?Ⅰ.every non-key attribute is functionally dependent on the full set of primary key attributes.Ⅱ.no non-key attributes exist in the relation.Ⅲ.the primary key consists of only one attribute.

单选题
2022-01-03 00:31
A、Ⅰ only
B、Ⅰ and Ⅱ only
C、Ⅰ and Ⅲ only
D、any of them
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正确答案
D
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