what is data modelling and ER diagram ?
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Applications come and go,
but the data remains!
data Modelling adn Entitity Relation Diagrams are pictorial representaion of all the selected tables ( with their columns , some copnstarints , constraints , ) relationship with other tables and type of relation ship ata glance .
Data Model Diagram is similar to this . it tells about the workflow of any user created application or procedure .
this is used by designers while designing any application . there is a seperate tool to prepare server model diagram , ER Diagrams , Functional Hierarchy Diagrams , Data Model Diagram
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