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read.pudn.comread.pudn.com/downloads141/ebook/607869/C%D3%EF%D1%D4%… · Web view据库技术的发展历史说明,层次数据库是数据库应用的先驱,而网状数据库则对数据库的概念,方法,技术进行了较全面的发展.它们是数据库技术中研究最早的两种类型的数据库.基于网状数据类型的数据库管理系统的运行,使数据库
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