*** Entity and Attributes *** · PKG_CUSTOMER CS CO CODE CS CODE VARCHAR2(4 BYTE) VARCHAR2(20 BYTE) VARCHAR2(1 BYTE) VARCHAR2(100 BYTE) CS TYPE CS NAME ·PKG PRODUCT PRD CO CODE VARCHAR2(4 BYTE) VARCHAR2(20 BYTE) VARCHAR2(1 BYTE) VARCHAR2(100 BYTE) PRD CODE PRD TYPE PRD DESC · PKG SALESMAN SM CODE VARCHAR2(20 BYTE) VARCHAR2(100 BYTE) VARCHAR2(100 BYTE) SM DESC SM ADDRESS ·PKG_ROUTE RT_CO_CODE RT CODE RT FROM LOC VARCHAR2(4 BYTE) VARCHAR2(4 BYTE) VARCHAR2(30 BYTE) VARCHAR2(30 BYTE) VARCHAR2(100 BYTE) RT TO LOC RT DESC ·PKG_STORE ST_CO_CODE ST CODE VARCHAR2(4 BYTE) VARCHAR2(4 BYTE) VARCHAR2(50 BYTE) VARCHAR2(8 BYTE) ST DESC ST CITY_CODE

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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.