数据库系统概念中文版

代码说明：

  数据库系统概念中文版，作为大学的核心课程，本书对于自学的同学非常友好，对于里面的伪代码和习题都建议同学自己去尝试。(The Chinese version of the concept of database system, as the core course of university, is very friendly to the students who teach themselves. For the pseudo-code and exercises in this book, students are advised to try it by themselves.)