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
- graph distance matrix
- graph eccentricity
- graphechon
- graphecon
- graph edge
- graph eigenvalue
- graph embedding
- grapheme
- graphene
- graphene-biopolymer composite materials
- graphene electrode
- graphene fiber
- graphene field effect transistor
- graphene-like
- graphene material
- graphene materials
- graphene nanocomposites
- graphene oxide
- graphene photoelectric detector
- graphene quantum dots
- graphene radio frequency device
- graph energy
- graphene spin valve
- graph entropy
- graph enumeration