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Data modelling user group for discussion and usage of various tools like Erwin/oracle designer etc

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Challenges data modellers face during conceptual design
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For any data modellers it is very important to understand the business requirments and visualize the business flow and design a data model. Initially as a data modeller we design the conceptual data model. What are the challenges we face during the design of conceptual data model...Do we need conceptual data model for no sql data modelling where we use json/bson. Any thoughts please put forward....!!!!

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