题目：
For relation R where primary key contains multiple attributes,no non-key attribute should be functionally dependent on a part of the primary key. This relation R is at least in
A． 1NF
B． 2NF
C． 3NF
D． BCNF
答案：
参考答案：B
For relation R where primary key contains multiple attributes,no non-key attribute should be functionally dependent on a part of the primary key. This relation R is at least in
A． 1NF
B． 2NF
C． 3NF
D． BCNF
参考答案：B
