数据库更新操作是SQL语句的重要组成部分，通过试验，加深学生对数据更新操作基本概念的理解与掌握,从而达到灵活应用的目的。-Database update operations are an important part of the SQL statement, through testing, to enhance the students the basic concepts of data update operations to understand and master, so as to achieve flexible application purposes.