理学 数据库系统设计 释 entity-relationship model 实体关系模型 通过客观事物及其联系进行形式化描述的数据模型。又称实体-联系模型、E-R模型。
数据库 数据库理论 释文 entity-relationship model 实体-联系模型
- Dubrovnik Republic
- Dubyago crater
- Ducal Palace
- Du Cao
- Duccio di Buoninsenga
- Du Changming
- Duchesne
- Du Chong
- Du Chongwei
- Duchy of Warsaw
- duck
- Duck Bay
- duck-billed platypus
- duck egg
- duck-fish farming system
- duck hepatitis A virus，DHAV
- Duck Hunting
- duck husbandry in biological fermentation bed
- duck husbandry in raised wire-floor
- duck-pearly mussel farming system
- duck plague
- duck plague virus，DPV
- duck-shaped bronze vessel
- duck tembusu virus, DTMUV
- duck virus hepatitis