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
- technetium[99Tc]methylenediphosphonate
- technetium line
- technetium star
- technetium(Tc)-99m-ethyl cysteinate dimer
- technetron
- technic
- technical
- technical and economic calculation of gas pipe network
- technical and economic evaluation of deposit
- technical and economic evaluation of mine construction projects
- technical and economic evaluation of mineral deposit
- technical and economic evaluation of mineral resources exploration
- technical and economic indicators of operation of thermal power plants
- technical and economic indicators of urban planning
- technical and economic indices of pumping station
- technical and further education institute
- technical appraisal of electronic records
- Technical Approval Committee of the National Fisheries Water Pollution Accident
- technical asset assessment
- technical assistance
- Technical bankruptcy
- technical barriers to agricultural trade
- technical basis of health supervision
- technical basis of software services
- technical benefit