What is the difference between a database and a data warehouse? Take a small representative database from any organization and try to convert it into a data warehouse. What are the visible advantages that you can make out?

Your question does not quite fit. A data warehouse is a logical construct which specifies how the data is used that is physically implemented in a database. A database is the physical aspects of your data regardless of whether that data is used for OLTP, OLAP, MDM, etc.

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