Companies often create a collection of summary tables as their first attempt at a data warehouse. While there are several drawbacks to this approach, there are also some advantages. Which of the following is an advantage of this approach over reporting from an operational database?
A. It is easier to understand because there are fewer summary tables.
B. Specific reports for which the summary tables were created will run faster.
C. It is easy to leverage many new reports from the summary tables.
D. Over time summary tables often naturally group into business subject areas.
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