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
- outranking methods
- outreach social work
- outrigger
- outrigger and belt members
- outrush
- out-shuffle
- outside
- outside broadcast van
- outside diameter of compressor
- Outside Director
- outside-eclipse variation
- Outside female job-seeker
- outside gettering
- outside option
- outside quality control
- outsider
- Outsider Art
- Outsiders: Studies in the Sociology of Deviance
- Outside Supervisors
- Outside the image
- Outside the Window
- outside threat
- outsole characteristics
- out source using
- outsourcing management of library