There are some basic database concepts and topics that everyone reading this book should know, and these will be covered in this first chapter. The following topics will be covered: History of relational database structures: Brief overview of why relational databases began OLTP and data ...
1.1 Database-System Applications 这一节比较简单,选取了几段话作为重点。 Task of Database Systems: A database system is a large, complex software system whose task is to manage a large, complex collection of data. Key to the management of complexity is the concept of abstraction. Abstraction ...
To start our discussion of database, in this section we examine some applications of database systems. For the purpose of this discussion, we consider a database to be a collection of related data and a databse management system (DBMS) to be the software that manages and controls access to...
数据库模式(schema)是数据结构的逻辑容器,被称作模式对象(schema objects) 每一个数据库用户拥有一个和用户名相同的模式,例如hr用户拥有hr模式。 在一个产品数据库中,模式的拥有者通常是数据库应用程序而不是一个人。 在一个模式中,每一个模式对象都有一个唯一的名字。如hr.employees代表hr模式下的employees表。
2.1BasicConcepts 語意 慨念 E-RDiagramforaBankingEnterprise,p.62 Example:BankingDatabase BankingDatabase:consists6relations: branch(branch-name,branch-city,assets) customer(customer-name,customer-street,customer-only) account(account-number,branch-name,balance) ...
The manuals in the basic group are closely related, which is reflected in the number of cross-references. For example,Oracle Database Conceptsfrequently sends users to a2 Daymanual to learn how to perform a task based on a concept. The2 Daymanuals frequently referenceOracle Database Conceptsfor...
This conceptual article serves as an introduction to numerous database topics. It provides a brief overview of what databases are in the context of cloud computing and highlights a few concepts central to their design and function. It also contains links to relevant conceptual and procedural tutoria...
关系型数据库简介 Introduction to Relational Databases - 达拉那大学学院 - 瑞典共计15条视频,包括:Lec 01 Database Basic concepts、Lec 02 Database Quality、Lec 03 Database Database components等,UP主更多精彩视频,请关注UP账号。
Introduction to Data Mining presents fundamental concepts and algorithms for those learning data mining for the first time. Each concept is explored thoroughly and supported with numerous examples. The text requires only a modest background in mathematics. Each major topic is organized into two chapter...
Big data is a blanket term for the non-traditional strategies and technologies needed to gather, organize, process, and gather insights from large data sets…