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
- shape category
- shape code
- shape coexistence
- shape context
- shape control
- shape-controlled synthesis of nanocrystal
- shape correction factor
- shaped activated carbon
- shaped Cassegrain antenna
- shaped charge blasting
- shaped dual reflector
- shape description
- shaped-pupil coronagraph
- shaped reflector
- shaped tube electrochemical machining
- shape-elastic scattering
- shape equation of lipid vesicles
- shape evolving
- shape factor
- shape feature
- shape feature description
- shape features of crude drugs
- shape from contour
- shape from motion
- shape from shading