Data Modeling - What is ERD?

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What is ERD?

Total Answers and Comments: 7

Last Update: September 18, 2008

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June 20, 2005 15:25:44

mdr.mohanrao

RE: What is ERD?

ERD Entity-Relation Diagram is a high level data model that includes all major entities and relationships

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July 18, 2005 20:57:48

Kenny

RE: What is ERD?

Data models are tools used in analysis to describe the data requirements and assumptions in the system from a top-down perspective. They also set the stage for the design of databases later on in the SDLC.

There are three basic elements in ER models:
Entities are the things about which we seek information.
Attributes are the data we collect about the entities.
Relationships provide the structure needed to draw information from multiple entities.

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July 18, 2005 20:58:02

kenny

RE: What is ERD?

You can investigate more about ERDs by viewing these sources available on the Internet:

Entity-Relationship Diagrams

4.1 Lecture: Entity Relationship Analysis

Guidelines

Domain Analysis

ERDIAG

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August 23, 2005 17:56:34

Sriharsha Hanumanth

RE: What is ERD?

ERD - Entity Relationship Diagram

ERD is a modeling technique that represents a logical design of a particular business process. Each entity has attributes and different entities are connected through primary key/foreign key relationships.

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March 15, 2006 06:57:15

sithusithu

Member Since: December 2005 Contribution: 161

RE: What is ERD?

Entity Relationship Diagram

Cherss

Sithu

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December 15, 2006 13:32:39

Ritu Khare

RE: What is ERD?

Every statement written above is correct regarding ER Diagrams except that they fall under conceptual design phase and not under logical.

A relational database design goes through 3 phases:

1. Conceptual ( ER Diagrams)

2. Logical ( Relational Schema)

3. Physical ( Physical Database objects)

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September 18, 2008 15:45:40

geeksds

Member Since: September 2008 Contribution: 4

RE: What is ERD?

Entity-Relationship diagram

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