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One can create the greatest data warehouse in the world, but if can't put data into it, it is completely useless. Designing and building solid ETL processes is critical to the success of data warehouse. If one takes time and design a flexible ETL process one will find that life becomes much easier later when one acquires a new data source. While not as flashy, ETL is just as important as the other aspects of Business Intelligence solution, if want a good BI solution, then need to take the time to develop a good ETL process.
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