What is ERD?

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mdr.mohanrao

  • Jun 20th, 2005
 

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

Kenny

  • Jul 18th, 2005
 

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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Sriharsha Hanumanth

  • Aug 23rd, 2005
 

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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Ritu Khare

  • Dec 15th, 2006
 

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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