Q. Consider the following relations:  EMP_NO EMP_NAME EMP_GRADE  JOB_ID DEPTNO START_DATE EMP DEPTNO DEPTNAME LOC LOW_SAL HIGH_SAL DEPT Display the name concatenated with the job ID, separated by a comma and space, and name the column Employee and Title. Display the employee name, employee No and start date of employees hired between February 1998, and May 1998. Order the query in ascending order by start date. Create a unique listing of all jobs that are in department 80. Include the location of the department in the output.

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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.