21. Decompose the relation Customers into a set of BCNF relations. Customers Customer_ID Customer_Name Rank Discount Prefecture City 100123 Jun Aoki Silver 10% Shiga Otsu 100143 Bob Smith Gold 20% Kyoto Кyoto 100233 Mary Brown Bronze 5% Shiga Otsu 100115 Jack Lee Silver 10% Shiga Kusatsu 100262 Aki Ito Gold 20% Kyoto Uji

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Fundamentals of Datawarehouse

A data warehouse is a data repository which is used to store large quantities of historical data that are mostly used for creating reports that help businesses to identify their weaknesses and strengths. For example, demographics data about people of a region can help businesses identify the needs and preferences of the region’s population. A data warehouse acts as a central storage for storing data that comes from one or more heterogenous sources. It also consists of data which can be old and of historical value. One of the most important applications of this type of system is that it is used for supporting business intelligence and data analytics applications.