Which of the following conditions will make a relation that is in first normal form to be in second normal form?   Ⅰ.every non-k

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问题 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.

选项 A、Ⅰ only
B、Ⅰ and Ⅱ only
C、Ⅰ and Ⅲ only
D、any of them

答案D

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