数据库系统练习答案，在postgresql8.2环境下编写。-Database system to practice the answer, in the preparation of postgresql8.2 environment.

这是postgres8.2.3的中文文档，详细的技术细节，希望对使用postgres数据库开发项目的朋友有用。-This is postgres8.2.3 the Chinese document in detail the technical details, and they hope to use the postgres database development projects useful friends.

PostgreSQL是迄今为止最为先进的开源数据库管理系统，此为postgresql源码-PostgreSQL is by far the most advanced open source database management system, the source code for postgresql