Question: Data warehouse databases obtain their data using each of the ways described below except one. Which one of the following is not used by data

Data warehouse databases obtain their data using each of the ways described below except one. Which one of the following is not used by data warehouse systems to obtain data?

Previous extracts from corporate operational databases.

Data entry by users of the data warehouse system.

Read data purchased from non

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corporate sources.

Read and process data from corporate operational database.

Data warehouse databases obtain their data using each of the ways

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