SourceSystems:
You own a business, For instance Banking. You will have lot of applications design for your bank.
There will be daily transactions happening on your application Databases. Which will be further demoralized and readily catered for Dataware house system as input.
Staging Area:
Business logic will be implemented here. You will never dump the source data directly to your DataMarts. You should design the extracted data from source in such way that it should serve as input to your master tables.
Presentation are:
Here actual reports will be generated for analysis purpose.
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