百度试题 结果1 题目The three-level of data abstraction in database system include:___level,___level, and___level 相关知识点: 试题来源: 解析 physical logical view
Database Abstraction LayerDambekalns, Karsten
Data AbstractionData abstraction is the process of distilling data down to its essentials. In an object schema, the abstract data model is implemented as a graph. The following figure shows such a graph structure for a genealogical database. For more information on data abstraction, see the ...
美 英 un.抽象数据库 网络数据库抽象;数据库抽象化 英汉 网络释义 un. 1. 抽象数据库
1.concept,thought,idea,view,theory,impression,formula,notion,hypothesis,generalization,theorem,generalityIs it worth fighting in the name of an abstraction? 2.absent-mindedness,musing,preoccupation,daydreaming,vagueness,remoteness,absence,inattention,dreaminess,obliviousness,absence of mind,pensiveness,woolgather...
2) database abstraction 数据库抽象化 3) data abstraction 数据抽象 1. It is characterized by the data abstraction and information hiding,and is in conformity with the thinking mode of the natural decomposition of real problems. 它具有数据抽象、信息隐藏等特点,符合人们对实际问题进行自然分解的...
1.3 数据库的特性 characteristics of the database approach 这一部分是Fundamentals第一章的重点,也让我对数据库的理解更上一层楼,特别是1.3.2部分的Data Abstraction。如下的四个特征,是DBMS区别于传统的文件处理系统的关键(P11, The preceding characteristics are most important in distinguishing a DBMS from tra...
The relational model is at a lower level of abstraction than the E-R model. Database designs are often carried out in the E-R model, and then translated to the relational model. For example, it is easy to see that the tablescustomerandaccountcorrespond to the entity sets of the same na...
We also use the more inclusive term database system as a collection of application programs that interact with the database along with the DBMS and the database itself. We provide more accurate definitions in section 1.3. 现在, 数据库是我们生活中不可或缺的一部分,我们在不经意间使用他。 在...
how–Clientwillusethespecificationsforinteractionwithdata–Clientofthewebdatabaseshouldnotknowthe“guts”oftheimplementationDataabstractioninJava•AnADTisdefinedbyaclass–TheADTintheweb/databaseapplicationwillbeaUser–Aprivateinstancevariablehidestheclassinternals–publicStringgetEmail();•Whatisprivateinthe...