Interview Questions Answers.ORG
Interviewer And Interviewee Guide
Interviews
Quizzes
Home
Quizzes
Interviews Data Warehouse Job Interviews:Ab InitioActuateAnalysis ServicesBO DesignerBusiness ObjectsCognos Data WarehouseColdFusionCrystal Enterprise SuiteData IntegrationData ScientistData StageData Warehouse AnalystData Warehouse BIData Warehouse Data MartData Warehouse DeveloperData Warehouse ManagerData Warehouse SupervisorData Warehouses MicroStrategyData WarehousingData Warehousing BasicsDatabase PartitioningEnterprise Data WarehouseETL (Extract, transform, load)General DatawarehousingHyperionImpromptuInformatica Data WarehousingLead Data ScientistMicro StrategyOperational Data StoreReportnetSAS (Statistical Analysis System)Warehouse AssistantWarehouse ConceptsWarehouse DataStageWarehouse Operation ManagerWarehouse Worker
Copyright © 2018. All Rights Reserved
General Datawarehousing Interview Question:
What is an ER Diagram?
Submitted by: AdministratorAd
The Entity-Relationship (ER) model was originally proposed by Peter in 1976 [Chen76] as a way to unify the network and relational database views.
Simply stated the ER model is a conceptual data model that views the real world as entities and relationships. A basic component of the model is the Entity-Relationship diagram which is used to visually represents data objects.
Since Chen wrote his paper the model has been extended and today it is commonly used for database design For the database designer, the utility of the ER model is:
it maps well to the relational model. The constructs used in the ER model can easily be transformed into relational tables.
it is simple and easy to understand with a minimum of training. Therefore, the model can be used by the database designer to communicate the design to the end user.
In addition, the model can be used as a design plan by the database developer to implement a data model in a specific database management software.
Submitted by: Administrator
Simply stated the ER model is a conceptual data model that views the real world as entities and relationships. A basic component of the model is the Entity-Relationship diagram which is used to visually represents data objects.
Since Chen wrote his paper the model has been extended and today it is commonly used for database design For the database designer, the utility of the ER model is:
it maps well to the relational model. The constructs used in the ER model can easily be transformed into relational tables.
it is simple and easy to understand with a minimum of training. Therefore, the model can be used by the database designer to communicate the design to the end user.
In addition, the model can be used as a design plan by the database developer to implement a data model in a specific database management software.
Submitted by: Administrator
Copyright 2007-2025 by Interview Questions Answers .ORG All Rights Reserved.
https://InterviewQuestionsAnswers.ORG.

https://InterviewQuestionsAnswers.ORG.
