The fifth chapter analyzes the performing requirements of the database of the teaching administration information system and offers design for some databases.
第五章分析了教学管理信息系纺的后台数据库的性能要求，并结合数据库理论对部分后台数据库进行了详细的设计。
This component typically runs on the same machine where the source database resides, although for some databases, it can also run remotely from the source database.
通常该组件在源数据库所在的机器上运行，但对于有些数据库，也存在远程运行。
For example, some databases provide special syntax on the select statements to declare the intentions of updating the rows selected by the select statement.
例如，有些数据库在select语句上提供了特殊的语法，声明用来更新select语句所选中的行。
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