Hi @Jose1965
Just to see if I understand correctly. You have two columns in a SharePoint List that support multiple values and want to insert all of those into a single field in the database correct?
You have two ways to do this. You can do a string(variable), and then you'll get a string like "[1,2,3,4]" or you do a Loop and append to a string variable and not an array variable. Then you can use that in your SQL action.
Can you please check if and let me know if you have any questions?
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Cheers
Manuel