[Notes from Pinal]: I know quite a lot of things about SSIS but every single time when I read notes from the field, I realize that there are so many small but very important features exist. A similar concept has been Using Package Configurations in SSIS 2012 and Beyond. Packages are the most critical part of the SSIS and configuring it correctly is extremely important.
Row_number function is used to generate a serial number for a given record set. But you need to always use ORDER BY clause so that the numbers are assigned to the specific order.
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