ed. First, the GPA of KFUPM students are calculated out of four while they are calculated out of five for KFU students. Second, KFUPM uses the standard English date whereas KFU uses the standard Arabic date. And there are many other conflicts that DSS database filtering tools are able to solve them so that data are stored in standard format.Query ToolThe data warehouse contains very huge data. However, the manager of any organization may only need specific portion of those data. As a result, the query tools are used in the DSS database in order to retrieve the appropriate and relevant data (6:20). The manager may then, analyze those data so that he or she comes up with the right decisions that serve the organization (6:20).Presentation ToolThe query tools provide some ad hoc queries and repots. Unfortunately, to use the query tools, the manager has to know the details of the query tools such as SQL (Structured Query Language), QBE (Query By Example) and many others. The presentation tools help the manager to select the most appropriate presentation format like bar graph, maps and summary reports. Of course, one picture is better than one thousand words. (5:43) CONCLUSION The data warehouse is read only database optimized for data analysis, query processing and decision-making process. Not surprisingly, it has become the main data source for modern decision support system during the past few years. Therefore, all organizations should exploit the power of this tool so that their top management could carry out the decision-making process with more confidence to achieve the desired goals. REFERENCES 1. Ballou, Donald P., and Giri Kumar Tayi. “Enhancing Data Quality in Data Warehouse Environments.” Communications of the ACM Jan.1999: 73-78. 2. Gould, Lawrence. “What You Need to Know About Data Warehousing.” Automotive Manufacturing & Production Jun. 1998: 64-67. 3. Scheuerman, Michael. “Planing to ...
