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An entity-relationship model (ERM) in software engineering is an abstract and conceptual representation of data. Entity-relationship modeling is a relational schema database modeling method, used to produce a type of conceptual schema or semantic data model of a system, often a relational database, and its requirements in a top-down fashion.

There are lot of ER diagramming tools. Some of the proprietary ER diagramming tools are Avolution, ConceptDraw, ER/Studio, ERwin, DeZign for Databases, MEGA International, OmniGraffle, Oracle Designer, PowerDesigner, Rational Rose, RISE Editor, SmartDraw, Sparx Enterprise Architect, SQLyog, Toad Data Modeler, Microsoft Visio, and Visual Paradigm

Some free software ER diagramming tools that can interpret and generate ER models, SQL and do database analysis are MySQL Workbench and StarUML. Some free software diagram tools which can't create ER diagrams but just draw the shapes without having any knowledge of what they mean or generating SQL are Kivio and Dia.

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