摘要
层次模型是ＤＢＭＳ所支持的三大数据模型之一．论述了利用关系模型表达层次模型的方法，用关系代数表示层次模型的ＤＬ／１语言；描述了增加和删除的算法，比较其检索效率。
Hierarchical model is one of the three data models that DBMS supports.This article puts forward a method to describe a hierarchical model using a relation model.The DL/1 language in hierarchical model is represented by relation algebra.It also describes the algorithm of adding and deleting, compares the retrieve efficiency and gives a design instance.
出处
《中南工业大学学报》
CSCD
北大核心
1999年第2期206-208,共3页
Journal of Central South University of Technology(Natural Science)
基金
国家"八六三"CIMS应用工程资助
