问题
单项选择题
设有关系R(CITY,ST,ZIP),其函数依赖集F = {(CITY,ST) ZIP,ZIP CITY },则关系R至多满足
A. 1NF
B. 2NF
C. 3NF
D. BCNF
答案
参考答案:C
设有关系R(CITY,ST,ZIP),其函数依赖集F = {(CITY,ST) ZIP,ZIP CITY },则关系R至多满足
A. 1NF
B. 2NF
C. 3NF
D. BCNF
参考答案:C