I am reading about data warehousing and I run into the concept of internal and external source systems.
Data are extracted from various internal and external source system files and databases.
I couldn't clearly distinguish between the concept of internal and external.
Any explanation of the key difference?
Thank you,
Best Answer
You could get data from data providers - for example, geoip data from Maxmind, rating data from Moody's, device data from BlueCava. Those are all external systems. Systems used by the organization are internal systems.