网友您好， 请在下方输入框内输入要搜索的题目：
题目内容
（请给出正确答案）
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(73).
A．1NF
B．2NF
C．3NF
D．BCNFThe construct eobegin Statement1; Statement2; coend means Statement1 and Statement2 are to be executed in parallel. The only two atomic actions in this construct are loading the value of a variable and storing into a variable. For the p
参考答案
更多 “ 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(73).A．1NFB．2NFC．3NFD．BCNFThe construct eobegin Statement1; Statement2; coend means Statement1 and Statement2 are to be executed in parallel. The only two atomic actions in this construct are loading the value of a variable and storing into a variable. For the p ” 相关考题
考题
设数据元素集合为{A，B，C，D，E，F}，下列关系为线性结构的是()。A.R={(D,E),(E,A),(B,C),(A,B),(C,F)}B.R={(D,F),(E,C),(B,C),(A,B),(C,F)}C.R={(A,B),(C,D),(B,A),(E,F),(F,A)}D.R={(D,E),(E,A),(B,C),(F,B),(C,F)}
考题
We()your terms satisfactory and now send you our order for 2 sets of the generator .A. findB. believeC. thinkD. suppose
考题
We()your terms satisfactory and now send you our order for your products.
A、believeB、findC、thinkD、suppose
考题
给定关系R（A,B,C,D,E）与S（B,C,F,G）,那么与表达式π2,4,6,7（ 2A.A．R.B，D，F，G
B.R.B,E，S.C,F,G
C.R.B，R.D,S.C,F
D.R.B，R.C,S.C,F
考题
给定关系 R（A,B,C,D,E）与 S（B,C,F,G）,那么与表达式π2,4,6,7（2A.R.B，D，F，G
B.R.B，E，S.C，F，G
C.R.B，R.D，S.C，F
D.R.B，R.C，S.C，F
考题
设置 d3 力导向图文本时，不可以使用以下哪种方式？A．xx.text((d)=＞{return d.relation});B．xx.text("hello")C．xx.text(d.relation);D．xx.text(function(d)=＞{return d.relation});
考题
3、4R策略是指与顾客建立关联（Relevance），反应（React），关系（Relation），回报（Return）。由美国的丹纳.史哈什（Done Schuhz）提出，4R策略阐述了一个全新营销模式。
热门标签
最新试卷