理学 数据库系统 释 data model 数据模型 数据库领域中定义数据及其操作的抽象表示方式。数据模型是数据库系统的核心和基础。各种数据库管理系统（DBMS）软件都是基于某种数据模型的。
data model 数据模型
数据库 数据库理论 释文 data model 数据模型
- emergency disposal team of critical animal epidemic situation
- emergency electrical power supply
- emergency equipment
- emergency escape device
- emergency evacuation
- emergency evacuation demonstration of transport category airplane
- emergency evacuation slide
- emergency evaluation
- emergency event
- emergency exercise
- emergency exercise programme
- emergency exercise project management
- emergency expert consultation
- emergency facilities
- emergency for radiological accidents
- emergency function-ensuring infrastructures for disaster response
- emergency funds
- emergency gate of hydropower station
- emergency guarantee measures
- emergency handle of road transportation
- emergency handling of military animal epidemic situation
- emergency handling plan
- emergency industry
- emergency industry technology innovative strategic alliance
- emergency information disclosure