数据库系统概念（杨冬青）习题答案下载

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数据库系统概念（杨冬青）习题答案Chapter 1 provides a general overview of the nature and purpose of database systems. The most important concept in this chapter is that database systems allow data to be treated at a high level of abstraction. Thus, database systems differsignificantly from the file systemsand general
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