ip库查询，mdb数据库，用的是QQ的。绿色免安装-ip the inquiries, mdb database, using the QQ. Green-free installation

主要介绍软件工程数据库测试过程中涉及到的相关知识点，比如查询优化等-Focuses on software engineering database testing process involved in the knowledge points, such as query optimization, etc.