说明：  本书是畅销书《SQL基础教程》第2版，介绍了关系数据库以及用来操作关系数据库的SQL语言的使用方法。书中通过丰富的图示、大量示例程序和详实的操作步骤说明，让读者循序渐进地掌握SQL的基础知识和使用技巧，切实提高编程能力。每章结尾设置有练习题，帮助读者检验对各章内容的理解程度。另外，本书还将重要知识点总结为“法则”，方便读者随时查阅。第2版除了将示例程序更新为对应*新的DB的SQL之外，还新增了一章，介绍如何从应用程序执行SQL。
(This book is the second edition of the best-selling book "SQL basic course". It introduces the use of relational database and SQL language used to operate relational database. Through abundant diagrams, a large number of sample programs and detailed operation steps, the book enables readers to master the basic knowledge and skills of SQL step by step, so as to improve their programming ability. Exercises are set at the end of each chapter to help readers test their understanding of each chapter. In addition, this book also summarizes the important knowledge points as "rules", which is convenient for readers to consult at any time. In addition to updating the sample program to the SQL corresponding to the * new DB, version 2 also added a chapter on how to execute SQL from the application.)