This book mainly introduces the functions and applications of three mainstream Web database systems. The book is divided into 4 parts, with a total of 15 chapters. The first part (Chapter 1-4) introduces the basic concepts of relational data and the basic knowledge of SQL language; the second part (Chapter 5-8) mainly explains the MySQL database system. The main functions and key technologies; the third part (Chapter 9-12) explains the functions and applications of the SQL Server database system; the fourth part (Chapter 13-15) introduces the architecture and usage of the Oracle database system. The appendix makes a horizontal comparison of the functions and characteristics of these three Web database systems for readers' reference in practical applications. The content of this book is highly practical. The three Web database systems introduced in the book are all database systems widely used on the Internet. The content selection focuses on main functions and key technologies, and provides detailed application examples to help Readers quickly master Web database technology and apply it. This book is suitable for the majority of network database users, database managers and network database application developers to read.
