hierarchical model database system造句

例句与造句

1. The database theory starts for 1960s , and come through hierarchical model database system , network model database system , and relational model database system
   数据库技术始于20世纪60年代,几十年来,数据库技术的发展经历了由层次数据库系统、网状数据库系统,到关系数据库系统。
2. It's difficult to find hierarchical model database system in a sentence. 用hierarchical model database system造句挺难的