Oracle数据库系统是目前世界上流行的关系数据库管理系统，系统可移植性好、使用方便、功能强，适用于各类大、中、小、微机环境。-Oracle　system is the world s popular relational　management system, system portability is good, easy to use, powerful, suitable for all types of large, medium and small, computer environment.