Ta老师题库

Suppose we have the relation schema R(A,B,C,D)with functional dependencies;F{A→B,B→C,C→D,D

9 查阅

Suppose we have the relation schema R(A,B,C,D)with functional dependencies;F{A→B,B→C,C→D,D→A},then R(A,B,C,D)at least is in

A．1NF

B．2NF

C．3NF

D．BCNF

参考答案:

D

计算机四级

相关问题:

How many equal valuable relation does set E process? E= {0,1,2}

What operation on relations R and S produces the relation shown be

For relation R where primary key contains multiple, no non－key attr

For relation R where primary key contains multiple attributes,no n

What is the contra positive of the relation represented in the exh

The software structure is an expression of the relationship among

Which of the following is not among the basic features of a relati

Which of the following conditions will make a relation that is in

随便看看:

版权所有,保留一切权利！© 2018-2023 Ta老师 Talaoshi.com 湘ICP备18019507号-1 联系QQ:469958。