Thanks a lot for your kind help dear.
I was able to find a solution, but I think it is not the best way. First of all, use the function of ROW_NUMBER() for each tables in order to make a Key relation. After that, use the Merge Join with the Key of ROW_NUMBER(). Then, merge first two tables, then merge with the third one, then merge with the forth one and so on.
But, I guess using the union could be useful and I`ll try it.
Anyway, thanks a lot again for your kind attention.