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ETL Source. An ETL Source refers to the connection to a data source. Connections to Excel files are maintained in the ETL Source panel with help from the Microsoft Excel page. The screenshot below shows two ETL Sources named Excel Workbook and zData Warehouse.

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Note

Warning – Unexpected Results Extracting Data from Excel

The driver which that opens and reads the Excel files controls how the data is read and extracted from Excel. Warning: The driver does not pay attention to the data type assigned to the columns in Excel! This can lead to unexpected results.
The driver looks at the data in the first few rows in each column to determine the data type (float, integer, varchar, etc) and length of character strings the driver will use to extract and data from Excel.

You may need to change the data type and re-cast the data in the Design page.
Recommendation: Read ETL+ Issues Importing from Excel.

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