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
- Recommendation Concerning the Protection and Promotion of Museums and Collections, Their Diversity and Their Role in Society
- Recommendation concerning the Status of Teachers
- Recommendation-oriented Promotion of Officials
- recommendations on the protection of cultural and natural heritage at the national leve
- recommendation system
- recommendatory bibliography
- Recommendatory List of Bibliography
- recommended book review
- recommended daily intake
- recommended navigation
- recommended nutrient intake
- recommended optional logistics enterprises
- recommended student
- recommended system
- recommender system
- recommend retrial
- recommend work safety and health standards
- recompression therapy
- recon
- reconciliation
- reconciliation of the conflict of tax jurisdictions on transnational business income
- reconciliation of the conflict of tax jurisdictions over cross-border capital gain
- reconciliation of the conflict of tax jurisdictions over cross-border income from personal service
- reconciliation of the conflict of tax jurisdictions over cross-border investment income
- reconciliation of the conflict of tax rights over cross-border income