Why businesses have separate databases and a data warehouse


Question 1) Why do some businesses have separate databases and a data warehouse? Why wouldn't most businesses have just one large database for all their data, both current and historical?

Question 2) What are the advantages of mobile wireless network over a wired network? How would a mobile wireless network impact a specific company you work for or another company?

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Basic Computer Science: Why businesses have separate databases and a data warehouse
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