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As I understand it, some data mining programs will take all the physical files and, after being described, create one logical file as you describe, that is, non normalized data. That way you can look at the data as one huge file. From what I understand these programs will actually take all the data and write them to a physical file for speed. And when need data gets updated to the original files it will re-write the non-normalized data file periodically. Data mining is something that intrigues me, but not something I have had the opportunity to get into, yet. I guess that's one of the problems with being in the transportation industry. Not much changes. Regards, Jim Langston Joe Teff wrote: > <SNIP> > In a data warehouse, you may just have one file with all of the information > in each record. Data warehouses are typically designed for ease of reporting > over any other consideration. You may even keep multiple copies like both > a detail file and several summarized files sorted and summarized differently. > You may even create a database from the info on a report. This allows the > users to go in and analyze the report as needed or even play "what if" games. +--- | This is the Midrange System Mailing List! | To submit a new message, send your mail to MIDRANGE-L@midrange.com. | To subscribe to this list send email to MIDRANGE-L-SUB@midrange.com. | To unsubscribe from this list send email to MIDRANGE-L-UNSUB@midrange.com. | Questions should be directed to the list owner/operator: david@midrange.com +---
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