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Data extraction and transform are based on the mapping relationship between the new system database and old system database. In generally, transform also includes data cleaning, which is to clear the dirty data that is from original database. Before data cleaning, analysis of data quality is demanded. Data loading is to load the data which has been extracted and transformed into the destination database through loading tools and SQL sentences programmed manually. This paper detailedly analyze the model of data processing in the credit evaluation system, in which the process and methods of data extraction,transform and loading have been studied deeply, and the steps of data integration also have been presented.
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