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Nov 17, 2017 at 0:14 comment added Bo Hu @ValarieSimmons You are right - you can't select all subscribers list as target list/DE. You can try using Ampscript to loop through FilteredDE, and update Subscriber's Email address by matching SubscriberKey
Nov 16, 2017 at 5:54 comment added Valarie Simmons Thanks for your response, Bo Hu. Actually I wanted to do the other way round. I am intending to update or insert new rows into All Subscribers List based on any new email addresses added to the filtered DE. In Query, I am not able to select All Subscribers as my target.
Nov 16, 2017 at 5:27 history answered Bo Hu CC BY-SA 3.0