The process of preparing the data by separating data at no charge. Information is recorded Data is complex or inconsistencies, and then collect the required data from multiple databases. Intended to ensure that the quality of information that is selected is appropriate. Complete information is used to ensure that data mining can be done. Indeed, most organizations are not prepared for data mining in particular. The data is taken from various sources. Poorly stored The information is taken from the outside and bring order to the information contained within. The main problem is data Quality and integrity of data
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