计算机专业英语教程 教学课件 作者桑莉君 unit05.pptVIP

UNIT 5Database COMPETENCIES After you have read this unit, you should be able to: Describe DB,DBMS and DBS. Discuss ER modeling . Describe SQL, query. Describe functionality of Access 2003. Text A Database Overview New Words and Phrases ongoing 　adj.正在进行的,不断发展的，持续存在的。 situation 　n. 情况，状况，形式，局面 underlying adj.在下面的, 根本的, 潜在的 Sequal 结构化查询语言 comprehensive adj.全面的, 广泛的, 能充分理解的, 包容的 statement n.声明, 陈述, 综述 institute n.学会, 学院, 协会 commercial adj.商业的, 贸易的 uppercase n.大写字母盘 New Words and Phrases separator n. 离析器, 脱脂器, 隔离物, 分离者 particularly adv. 特别，尤其 diagram n. 简图，图解，图表 representation n. 表现，描述，表现形式 diamond n. 菱形 schema n. 提要，纲要 sophisticated adj. 复杂巧妙的，先进的，精密的  Notes 1.Almost all sophisticated data management situations rely on an underlying database and the support structure that allows the user (either a human or a program) to interact with it. [分析] “all sophisticated data management situations”是主语，“an underlying database and the support structure”是宾语。“rely on” 的意思“依赖于”。 [译文]几乎所有的先进数据管理都依赖于低层的数据库和它所支持的结构的相结合。 Notes 2.The database schema provides the logical view of the data in the database, independent of how it is physically stored. [分析] “independent of”的意思是“独立于”。 [译文]数据库关系提供了一个独立于数据库物理结构的逻辑关系。 Notes 3. The user then interacts with the engine software to access and possibly modify the contents of the database stored on disk. [译文]然后，用户操纵引擎软件访问存储在磁盘上的数据库并修改数据库的内容。 Notes 4. The position of the various elements of an ER diagram is not particularly important, though if some thought is given to it they are easier to read. Note that a relationship such as Rents can have its own associated attributes. [译文] ER图中各个元素的位置不是特别重要 。 Notes 5. From an ER diagram, a database manager can define the necessary schema and create the appropriate tables to support the database specified by the diagram. [译文] 从一个ER图，数据库管理者能定义出必要的纲要，创建适当的表来支持图所表达的数据库。 Text B Some Frequently? Used Database Management Systems New Words and Phrases comprehensive 　n. 全面的,所有的