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
- code-transparent system
- code tree
- codetta
- code value
- code walk-through
- code with correction
- code word
- codeword
- Codeword Workshop
- codex
- Codex alimentariu
- codex alimentarius ad hoc intergovernmental task force on food derived from biotechnology
- Codex Committee on Cereals,Pulses and Legumes
- Codex Committee on Cocoa Productsand Chocolate
- Codex Committee on Contaminants in Food
- Codex Committee on Fats and Oils
- Codex Committee on Fish and Fishery Products
- Codex Committee on Food Additives
- Codex Committee on Food Hygiene
- Codex Committee on Food Import and Export Inspection and Certification Systems
- Codex Committee on Food Labelling
- Codex Committee on Fresh Fruits and Vegetables
- Codex Committee on General Principles
- Codex Committee on Meat Hygiene
- Codex Committee on Methods of Analysis and Sampling