will be vary based on the storage like star flex schema data ware house, snow flake data ware house, metadata ware house and enterprise data warehouse systems. In past data is being maintained in the papers, tapes and disks and now the data is maintained in the granular, systematic order and in highly secure way in appropriate data bases with structured tables, constrains, data diagrams, and keys combined know as data ware house. As of now we would make a difference between the data in legacy…
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