【单选题】以下关于扩展E-R图设计的描述中,正确的是()
A.
联系可以看作实体,与另一实体产生联系,称为聚合
D.
三个实体之间的联系与三个实体之间的两两联系是等价的
【多选题】下列关于直方图的描述中正确的有 。
B.
对于同样的数据、不同的分组方式,获得的直方图的形状不完全相同
E.
直方图可以帮助我们把主要精力集中在少数关键问题上
【判断题】linguistic forms having reference have sense
【单选题】下列关于E-R图向关系模式转换的描述中,正确的是()。
A.
一个多对多的联系可以与任意一端实体对应的关系合
C.
一个一对多的联系只能转换为一个独立的关系模式
【简答题】Most people agree that it’s important to have a sense of humour. Having the ability to laugh can help one overcome anxiety, and make better decisions in difficult situations. People with a well-develo...
【简答题】Most people agree that it’s important to have a sense of humor. Having the ability to laugh can help one overcome anxiety, and make better decisions in difficult situations. People with a well-develop...
【判断题】linguistic forms having sense have reference
【简答题】根据所听到的内容作答_____。 A)Having a point. B)Having flexibility. C) sense. D)Being interestin9.
【单选题】What is the result of having a sense of common interest?
A.
Learning more from friends.
B.
Grouping people differently.
C.
Bringing people together.
D.
Meeting a lot more people.
【单选题】下列关于E-R图向关系模式转换的描述中,正确的是( )。
A.
一个多对多的联系可以与任意一端实体对应的关系合并
C.
一个一对多的联系只能转换为一个独立的关系模式