- 層次數(shù)據(jù)模型
- 分級數(shù)據(jù)模型
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hierarchical data model中文什么意思
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- The history of the development of database technology can be divided into three phases : the first generation is the reticulation / hierarchical data model based on database ; the second generation is the relational data model based database ; the third generation database which has the object oriented character breakthroughs the localization of the traditional database model which is unable to build model based on complex data structure . the third generation has led the database system to a new time
數(shù)據(jù)庫技術(shù)的發(fā)展經(jīng)歷了三個階段：第一代數(shù)據(jù)庫系統(tǒng)是基于網(wǎng)狀、層狀數(shù)據(jù)模型的網(wǎng)狀、層狀數(shù)據(jù)庫管理系統(tǒng)；第二代數(shù)據(jù)庫是基于平面關(guān)系模型的關(guān)系數(shù)據(jù)庫系統(tǒng)；以面向?qū)ο竽Ｐ蜑榇淼牡谌鷶?shù)據(jù)庫系統(tǒng)突破了傳統(tǒng)數(shù)據(jù)模型在復雜數(shù)據(jù)建模和管理方面存在的局限性，使數(shù)據(jù)庫系統(tǒng)進入了新的時代。
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