"2022分布式数据库SQL语句优秀文档"

The "Distributed Database SQL Statements 2022 Excellent Document.ppt" is a comprehensive presentation on the SQL language and its application in distributed database systems. The presentation covers various aspects of SQL, including its history, standards, and structural components. The presentation begins with an introduction to SQL and its origins, highlighting its development and evolution from IBM's SYSTEM R SEQUEL to the ANSI and ISO standards of the 1990s. The emergence of SQL3, also known as SQL99, is discussed in relation to its system architecture, which includes components such as Views, Tables, Files, and the Data Definition Language (DDL). The document delves into the details of SQL's Data Definition Language (DDL) and Data Manipulation Language (DML), emphasizing the importance of maintaining integrity and security in database operations. The requirements for creating different database structures, such as Tables, Views, and Indexes, are outlined, along with examples of the syntax for creating these structures using SQL statements. The presentation provides practical examples of SQL statements for creating database structures, such as the syntax for creating a Table, View, or Index, along with descriptions for each of these structures. Using the example of creating a Table named "DEPT," the presentation demonstrates the syntax and parameters for creating a table with specific attributes and characteristics. Overall, the "Distributed Database SQL Statements 2022 Excellent Document.ppt" serves as a valuable resource for understanding the fundamentals of SQL in the context of distributed database systems. It covers a range of topics, from the history and standards of SQL to the practical application of SQL statements for creating database structures. The document aims to equip practitioners and researchers with a comprehensive understanding of SQL and its role in managing distributed databases effectively.