Hi Amine,
Consider your internal table as ITAB_COLUMN and work area as WA_COLUMN.
Suppose your internal table contains two fields namely column1 and column2.
loop at itab_columns into wa_columns.
if wa_column-column1 NE wa_column-column2
write:/ wa_column-coumn1,
wa_column-column2,
sy-tabix.
endif.
Here sy-tabix indicates in which record the contents are mismatching.