[解析] 电子数据交换(Electronic Data Interchange,EDI)是融现代计算机技术和远程通信技术为一体的产物。ISO(国际标准化组织)将EDI描述为:“将商业或行政事务处理,按照一个公认的标准,形成结构化的事务处理或信息数据结构,从计算机到计算机的数据传输”。标准化EDI己成为全世界电子商务的关键技术,实现了世界范围内电子商务文件的传递。先进的EDI技术具有开放性和包容性,在开发EDI网络应用中,无需改变现行标准,而只需扩充标准。EDI技术包括三个部分,即硬件系统、翻译软件和传输系统。由于EDI是国际范围的计算机与计算机之间的通信,所以EDI的本质是被处理业务的数据格式的国际统一标准。
B.SELECT author FROM book WHERE book_name LIKE'电子商务*'
C.SELECT author FROM book WHERE book_name='电子商务%'
D.SELECT author FROM book WHERE book_name LIKE'电子商务%'
A B C D
D
[解析] 在SQL数据查询中,关键字LIKE可以用来进行字符串的匹配,其一般语法格式如下。 [NOT]LIKE '<匹配串>'[ESCAPE'<换码字符>'] 其含义是查找指定的属性列值与<匹配串>相匹配的元组。<匹配串>可以是一个完整的字符串,也可以含有通配符“%”和“_”。其中:“%”(百分号)代表任意长度(长度可以为0)的字符串:“_”(下划线)代表任意单个字符。 要查询book表中所有书名以“电子商务”开头的书籍作者,可使用的SQL语句如下。 SELECT author FROM book WHERE book name LIKE'电子商务%'
It should go without saying that the focus of UML is modeling. However, what that means, exactly, can be an open-ended question. ______ is a means to capture ideas, relationships, decisions, and requirements in a well-defined notation that can be applied to many different domains. Modeling not only means different things to different people, but also it can use different pieces of UML depending on what you are trying to convey. In general, a UML modelis made up ofone or more ______. A diagram graphically represents things, and the relationships between these things. These ______ can be representations of real-world objects, pure software constructs, or a description of the behavior of some other objects. It is common for an individual thing to show up on multiple diagrams; each diagram represents a particular interest, or view, of the thing being modeled. UML 2.0 divides diagrams into two categories: structural diagrams and behavioral diagrams. ______ are used to capture the physical organization of the things in your system, i.e., how one object relates to another. ______ focus on the behavior ofelements in a system. For example, you can use behavioral diagrams to capture requirements, operations, and intemal state changes for elements.