In this lesson, you create a simple ETL package that extracts data from a single flat file source, transforms the data using two lookup transformations, and writes the transformed data to a copy of the FactCurrencyRate fact table in the AdventureWorksDW2012 sample database. As part of this lesson, you learn how to create new packages, add and configure data source and destination connections, and work with new control flow and data flow components.
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For this tutorial, the source data is a set of historical currency data in a flat file named SampleCurrencyData.txt. The source data has the following four columns: the average rate of the currency, a currency key, a date key, and the end-of-day rate.
When working with flat file source data, it's important to understand how the Flat File connection manager interprets the flat file data. If the flat file source is Unicode, the Flat File connection manager defines all columns as [DT_WSTR] with a default column width of 50. If the flat file source is ANSI-encoded, the columns are defined as [DT_STR] with a default column width of 50. You probably have to change these defaults to make the string column types more applicable for your data. You need to look at the data type of the destination, and then choose that type within the Flat File connection manager.
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