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1、计算机英语实用教程,人民邮电出版社,司爱侠 张强华 编著,Unit 7 Database,退出,New Words,computing kEm5pju:tiN n.计算,处理 query 5kwiEri n. 参数 originate E5ridVineit vi.起源,发生 ledger 5ledVE n.分类账,分户总账 receipt rI5si:t n.收据,收条 model 5mCdl n.样式,模型 layman 5leImEn n.外行 terminologyt:mI5nRlEdVI n.术语,专门名词 hierarchical 7haiE5rB:kikEl adj.分等级的 u
2、nambiguous 5QnAm5bijuEs adj.不含糊的,明确的,New Words,community kE5mju:nItI n.社区；团体，社团；大众,公众 deal di:l vi.处理 concurrencykEn5kQrEnsi n.并发性 failure 5feiljE n.故障 increasingly In5kri:sINlI adv.越来越多地，逐渐增加地，日益地 significant si5nifikEnt adj.有意义的,重大的,重要的 index 5indeks n.索引,指数 vi.做索引 upward 5QpwEd adj.向上的 Link liNk
3、n.&v.链接 nesting 5nestiN n.嵌套,New Words,attribute E5tribju:t n.属性,特征 tuple 5tjupl n.元组 enumerate i5nju:mEreit v.列举 instance 5instEns n.实例 adhere Ed5hiE vi.遵守 Rule ru:l n.规则 qualify 5kwClifai vt. 具有资格,证明合格；限制,限定 principle 5prinsEpl n.法则,原则,原理 enforce in5fC:s vt.执行,坚持,强迫 explicitly iks5plisitli adv.明白地
4、,明确地,New Words,cardinality 7kB:di5nAliti n.基数性，基数；集的势 Key ki: n.键 join dVCin v.&n.连接,联结 combine kEm5bain v.(使)联合,(使)结合,组合 match mAtF n.&v.匹配 compound 5kCmpaund adj.复合的 dialect 5daIElekt n.行话,方言 generating 5dVenE7reitiN n.生成,发生,产生 filter 5filtE vt.过滤 n.筛选,Phrases,in answer to 回答, 响应 computing discipl
5、ine计算学科 industrial revolution工业革命 relational model 关系模型 hierarchical model 层级模型 be independent of 与.无关; 不依赖; 不取决于; 不受.限制 query language 查询语言 primary key 主键 adhere to 遵守 in principle 原则上；大致上；通常,Abbreviations,DBMS 数据库管理系统(database management system) SQL 结构化查询语言(Structured Query Language),Text,请老师朗读并讲解
6、课文,Notes,1 In computing, a database can be defined as a structured collection of records or data that is stored in a computer so that a program can consult it to answer queries. 本句中，that is stored in a computer so that a program can consult it to answer queries是一个定语从句，修饰和限定a structured collection re
7、cords or data。在该从句中，so that a program can consult it to answer queries是一个目的状语，修饰谓语is stored。,Notes,2 The model in most common use today is the relational model, which in laymans terms represents all information in the form of multiple related tables each consisting of rows and columns (the true defi
8、nition uses mathematical terminology). 本句中，which in laymans terms represents all information in the form of multiple related tables each consisting of rows and columns (the true definition uses mathematical terminology) 是一个非限定性定语从句，对the relational model作补充说明。in laymans terms的意思是“用外行的话说”，each作multipl
9、e related tables的同位语，consisting of rows and columns是一个现在分词短语，作定语，修饰和限定multiple related tables。,Notes,3 An example is the relational model: all serious implementations of the relational model allow the creation of indexes which provide fast access to rows in a table if the values of certain columns a
10、re known. 本句中，which provide fast access to rows in a table是一个定语从句，修饰和限定indexes。if the values of certain columns are known是一个条件状语从句，修饰allow。,Notes,4 The flat (or table) model consists of a single, two-dimensional array of data elements, where all members of a given column are assumed to be similar va
11、lues, and all members of a row are assumed to be related to one another. 本句中，where all members of a given column are assumed to be similar values, and all members of a row are assumed to be related to one another是一个非限定性定语从句，对a single, two-dimensional array of data elements进行补充说明。,Notes,5 In a hierar
12、chical model, data is organized into a tree-like structure, implying a single upward link in each record to describe the nesting, and a sort field to keep the records in a particular order in each same-level list. 本句中，implying a single upward link in each record to describe the nesting, and a sort f
13、ield to keep the records in a particular order in each same-level list是一个现在分词短语，作a tree-like structure的非限定性定语，to describe the nesting是一个动词不定式短语，作定语，修饰和限定a single upward link，to keep the records in a particular order in each same-level list也是一个动词不定式短语，作定语，修饰和限定a sort field。,Notes,6 Yet, in order to e
14、nforce explicit integrity constraints, relationships between records in tables can also be defined explicitly, by identifying or non-identifying parent-child relationships characterized by assigning cardinality (1:1, (0)1:M, M:M). 本句中，in order to enforce explicit integrity constraints作目的状语，by identi
15、fying or non-identifying parent-child relationships characterized by assigning cardinality (1:1, (0)1:M, M:M)作方式状语。在该方式状语中，characterized by assigning cardinality (1:1, (0)1:M, M:M)是一个过去分词短语，作定语，修饰和限定parent-child relationships。,Exercises,请做课后练习 (答案见附录),计算机英语教程，北京，人民邮电出版社：国家级十五规划教材 电脑英语掌中宝，南京，东南大学出版社：
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