Question: What is the comparison of the differences between a database, a data warehouse and a data mart? What are the elements and major building blocks

What is the comparison of the differences between a database, a data warehouse and a data mart?
What are the elements and major building blocks of a data warehouse and what each of them does?
What are the basic components of a data warehouse?
How important it is for a company to have a data warehouse on the web?

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