Database are very useful because they let the organizations to improve and increase their productivity by automating the operating processes daily management. When firm database have been well stored they can be easily used to support management processes as well as decision’s checking, planning and support (Decisional Support System).
OLAP analysis (On-Line Analytical Processing) is the main mode to enter Data Warehouse data: it lets users to work with complex and interacting analysis on the multidimensional model.
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