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
- higher-codimensional surface
- higher cohomology operation
- higher commutator
- higher covariant derivative
- higher-degree equation
- higher derivative
- higher derivative terms
- higher difference
- higher differential
- higher differentiation
- higher dimension
- higher-dimensional
- higher-dimensional category
- higher-dimensional connectedness
- higher-dimensional geometry
- higher-dimensional group theory
- higher-dimensional quasi-conformal mappings
- higher-dimensional space
- higher-dimensional surface
- higher-dimensional theory
- higher-dimensional variety
- higher education
- Higher Education Act 2004
- Higher Education Act (U.S.A.)
- higher education evaluation