Execute Table.Combine between tables

Thanks ImkeF for you reply, 

Im developing a solution with an if statement for identify when I have to do an historical load or an append of the new data, and its work good.

So, I have 2 tables (the same in the first post), I manually refresh the newest data and manually refresh the historical data but here I have implemented this in Power Query M:

//In this point I get a var from a table in my Excel

#"Changed Type3" = Table.TransformColumnTypes(Parametro,{{"Nombre_Parametro", type text}, {"Valor_Parametro", Int64.Type}}),
Habilitar_Carga = Number.ToText(#"Changed Type3"{2}[Valor_Parametro]),

//if the var is 1 I will load historical data, if the var is 0 I will append the newest data

Tabla = if Habilitar_Carga <> 1 then CargarHistorico() else RealizarAppend()

The functions are:

//Function for append new data

RealizarAppend = () =>
let
#"Appended Query" = Table.Combine({Planes_Accion, Planes_Accion_Nuevo}),
#"Removed Duplicates" = Table.Distinct(#"Appended Query", {"EVENT_NUMBER_EVENT_ITEM_NO"})
in
#"Removed Duplicates",

//Function for to load historical data

CargarHistorico = () =>
let
Source = Oracle.Database("ellrep", [HierarchicalNavigation=true, Query="SELECT ...."]),
#"Added Custom" = Table.AddColumn(Source, "EVENT_NUMBER_EVENT_ITEM_NO", each [EVENT_NUMBER]&[EVENT_ITEM_NO]),
#"Appended Query" = Table.Combine({#"Added Custom", Planes_Accion_Nuevo}),
#"Removed Duplicates" = Table.Distinct(#"Appended Query", {"EVENT_NUMBER_EVENT_ITEM_NO"})
in
#"Removed Duplicates",

The good thing about this solution is that do not duplicate the data as in the solution of Union in DAX.

I hope this can help other people.

Thanks, Sebastian