E-R model is good for defining entity and relationship, but restrict concepts of abstraction and inheritance. In this paper, we propose a database conceptual modeling procedure, called I-ER modeling, through analyzing similarity and difference between E-A and E-R, applying abstraction concepts of...
Hierarchies in a multidimensional model: From conceptual modeling to logical representation Hierarchies are used in data warehouses (DWs) and on-line analytical processing (OLAP) systems to see data at different levels of detail. However, many kin... E Malinowski,E Zimanyi - 《Data & Knowledge...
conceptual database model 美 英 un.概念数据为模型 英汉 un. 1. 概念数据为模型
We will provide conceptual and logical model examples and leave the physical modeling up to you, depending on your database management system. Human resources Human resource (HR) departments are generally responsible for keeping track of employees and departments, their roles, managers, and so on....
databaseconceptual modelThe components of map information are analyzed theoretically in this paper, and the map information includes mainly the spatial information, at tributive information and temporal characteristics information. Then the digital map entity is defined according to construction ...
Overview--development of a geodatabase and conceptual model of the hydrogeologic units beneath Air Force Plant 4 and Naval Air Station-Joint Reserve Base C... Shah SD (2004) Development of a geodatabase and conceptual model of the hydrogeologic units beneath Air Force Plant 4 and Naval Air ...
Multiple views.A DBMS can also provide many views of a single database schema. A view defines what data the user sees and how they see the data. The DBMS provides a level of abstraction between the conceptual schema that defines the logical structure of the database and the physical schema...
This walkthrough shows how to generate a conceptual model from an existing database. This walkthrough consists of the following basic tasks:Creating the School sample database, which contains the schema and data. This database is used to demonstrate the “database first” scenario. Using the ...
Basically, we have two categories of database models, which are logical database models and conceptual data models, respectively. The relational database model and object-oriented database model are typical representatives of logical database models. And the ER model, EER model and UML class ...
are closely related, which is reflected in the number of cross-references. For example,Oracle Database Conceptsfrequently sends users to a2 Daymanual to learn how to perform a task based on a concept. The2 Daymanuals frequently referenceOracle Database Conceptsfor conceptual background about a ...