数据建模 Database Modeling:概念 (Conceptual) vs 逻辑 (Logical) vs 物理数据 (Physical) 模型 数据建模是一种使用实体关系图(ER图)记录软件系统的技术,实体关系图是公司数据库表中数据结构的表示。它是公司业务需求的非常有力的表达。数据模型有多种用途,从高级概念模型、逻辑到物理数据模型,通常由实体关系图表示...
In the past, DB research used to focus on the logical structure of objects, whereas IR research dealt with the content of documents. By combining these two approaches and incorporating also the layout structure of objects, a conceptual model for integrated IR and DB systems is outlined....
(Types of Data Modeling) 数据建模可以分为几个不同的类型,每种类型都有其特定的用途和特点。 概念数据模型(Conceptual Data Model) (Conceptual Data Model) 概念数据模型是数据建模的初步阶段,主要用于高层次的描述数据及其关系。它通常不涉及具体的实现细节,而是关注于数据的业务意义。概念数据模型通常使用实体-关...
Conceptual modellingLogical modelQuery languageIn recent years, data analytics has been studied in a broad range of areas, such as health-care, social sciences, and commerce. In order to accurately capture user requirements for enhancing communication between analysts, domain experts and users, ...
model theory (redirected fromLogical model) Encyclopedia model theory n (Logic) the branch of logic that deals with the properties of models; the semantic study of formal systems ˈmodel-ˌtheoˈreticadj Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins...
There are three different levels of data models: conceptual, logical, and physical. Of these, the conceptual model is the most abstract, and the logical model has a few more technical details. The physical model has all the details of the physical database, such as data types (integer,decim...
An LDM hasmigrated entity identifiers and is less abstract than a conceptual data model(CDM), but does not allow you to model views, indexes and other elements thatare available in the more concrete physical data model (PDM). 逻辑数据模型(LDM)可以帮助你分析信息系统的结构,独立于任何特定的物理...
A logical datamodel (LDM) helps you analyze the structure of an information system,independent of any specific physical database implementation. An LDM hasmigrated entity identifiers and is less abstract than a conceptual data model(CDM), but does not allow you to model views, indexes and other...
Then you create the, which is the bulk of thework. It includes taking what you learned in the business requirements gathering and conceptual data model stages and discerning the detail of the entities and relationships present in the conceptual model. From this you create the application specificat...
The relational data model and relational database sys... TJ Teorey,SS Lightstone,T Nadeau,... - 《Journal of Digital Information Management》 被引量: 115发表: 2006年 Information Modeling and Relational Databases : From Conceptual Analysis to Logical Design T. Halpin: Information Modeling and ...