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
- World Energy Council
- World Environment Day
- World Ethno-National Studies
- World Evangelical Fellowship
- World Expo Museum
- world factory
- world famous earthquake
- World Federation of Acupuncture-Moxibustion Societies
- World Federation of Chinese Medicine Societies
- World Federation of Scientific Workers
- World Federation of the Sporting Goods Industry
- World Fellowship of Buddhists
- world fertility survey
- World Festival of Black Arts
- World Film Aesthetics History
- World Film Festival in Montreal
- Worldfish Center
- world fisheries
- World Food Day
- world food day
- World Forest Day
- world forestry
- World Foundry Organization
- World Freestyle Football Association
- world function