Hey! i have an excel spread sheet with people id's. one is last months and another one is this months. my question is how do i join them together with join tool for this formula: =IFERROR(VLOOKUP(E54,'January'!$E:$E,1,0),"Left on January") i believe it has to be done with if IsNull([ID]) then 'Left on January' else [ID] endif but the joining is what triggers me
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