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SSIS error in data flow task import from excel to SQL server 2012.

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ssis source excel - setup

nononame2021 261 Reputation points
2022-03-29T06:50:15.573+00:00

may i know what is the usage of External Columns and Output column in "Input and Output properties" in Advance Editor for "Excel Source" in data flow task?

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  1. when i click the "Excel Source", then click "preview", it show below, how to fix it ?

187783-image.png

SQL Server Integration Services
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