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
- heavy nucleus
- heavy oil
- heavy oil cold recovery
- heavy oil cracking
- heavy oil kiln
- heavy oil partial oxidation process
- heavy oil recovery
- heavy oil reservoir
- heavy oil steam injection recovery
- heavy oil wastewater reuse boiler technology
- heavy pain
- heavy particle
- heavy particle therapy
- heavy penalty for petty crime
- heavy photon
- heavy quark
- heavy quark effective theory
- heavy rainfall numerical prediction model
- Heavy Snow
- heavy-sphere method
- heavy symmetrical top
- heavy-tailed distribution
- heavy traffic
- heavy traffic limit theorem
- heavy transition element