武汉理工大学数据库系统原理总复习题(完整版含答案).pdf

. 武汉理工大学 数据库系统原理总复习题（完整版含答案） 1. Questions 1.1 What is the purpose of a database? ANSWER：The purpose of a database is to help people track of things. 1.2 What is the most commonly used type of database? ANSWER: the most commonly used type of database is the relational database. 1.7 Define the terms data and information. Explain how the two terms differ. ANSWER: Dataare recorded facts and numbers. we can now define information as: Knowledge derived from data. Data presented in a meaningful context. Data processed by summing, ordering, averaging, grouping, comparing or other similar operations. 1.10 What problem can occur when a database is processed by more than one user? ANSWER:Whenmore than one user employs a database application, these is always the chance that one users work may interfere with others. . . 1.12 What is the purpose of the largest databases at e-commerce companies such as A? ANSWER: The largest databases are those that track customer browser behavior. （用来记录用户的浏览行为的。） 1.13 How do the e-commerce companies use these databases? . ANSWER:E-commercecompanies use Webactivity databases to determine which items on a Web page are popular and successful and which are not. 1.14 Howdo digital dashboard and data mining applications differ from transaction processing applications? ANSWER: Digital dashboards and other reporting systems assess past and current performance. Data mining applications predict future performance. 1.15 Explain why a small database is not