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
- Manifesto of Montecristi
- Manifesto of Panama(1975)
- manifold
- manifold assumption
- manifold classification
- manifold crystallization
- manifold economic sectors in the transition period
- manifold equivalent to zero
- manifolder
- manifold geometry
- manifold learning
- manifold of algebraic elements
- manifold of bounded curvature
- manifold of conics
- manifold of constant curvature
- manifold of flags
- manifold of groups
- manifold of Kähler type
- manifold of lines
- manifold of mappings
- manifold of metrics
- manifold of negative curvature
- manifold of positive curvature
- manifold of pre-assigned curvature
- manifold of singularity