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The main sources of external data are the Internet; the government; trade, business, and professional associations; the media; trade journals; universities and foundations; corporate annual reports
some sources of data are information
Simple, Primary and Secondary Data
A data mart is a data repository that gathers data and similar items from certain users or workers. Its characteristics include being focused on one subject like finances or sales, only gathering data from a couple sources like the external data or central data warehouse, and being controlled by only one source.
national sample survey