How can I group two joined tables
I found my answer, thanks!

select cant.id,CANT.CANT_VAL,CANT.COD_VAL,CANT.FK_ID_CHEST from cant
union
select COL.FK_ID_COL_DMA,COL.CANT_VAL,COL.COD_VAL,CANT.FK_ID_CHEST from col 
    inner join cant
        on cant.id=COL.FK_ID_COL_DMA