WHAT IS A MODELING TOOL IN DATA WAREHOUSE?

Those who are working with ERWIN Tool called data modeler .A data modeler can design data base of DWH with the help of fallowing tools

A ETL Developer can extract data from source databases (or) flat files(.txt,csv,.xls     etc) and populates into DWH .While populating data into DWH they are some  staging areas can be maintained between source and target .these staging areas are called staging area1 and staging area2.

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