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Export any fields only since last upload (by Data Loader)



I ‘m using apex Data Loader 11.0 for extracting two fields of a particular object. Also I perform UPSERT.


I want to export two fields only since last upload.



Say I’ve UPSERTED record R1, R2, and R3 at my first UPSERT.

At second UPSERT I UPSERTED say record R1, R2 and R4.


Now I want to do export these three records only.


Is it possible to perform this functionality using Data Loader?


I know that at the time of exporting, I have option to write SOQL statement but I am confused to write any for this job!


Any help will be highly appreciated.


Thanks and regards,