How to compare two fields in same column in internal table? ABAP

Question

How to compare fields in same column in internal table? ABAP

Example to compare in column A:

col A | col B
 A    |   B
 A    |   A
 A    |   A
 B    |   B
 B    |   B

Answer 1

I would first loop through the contents of your internal table and do my comparison between field 1 and field 2 within the loop. The comparison is done on a row by row level. If the condition is true, I would add my business logic within the IF statement.

LOOP at itab.
   IF itab-col1 EQ itab-col2
   "Business logic.
   ENDIF. 
 ENDLOOP.

Would this suffice?

field-symbols: <ls_line> type (line structure of itab)

loop at itab assigning <ls_line>.
  if <ls_line>-column_a NE <ls_line>-column_b.
    write: / sy-tabix, <ls_line>-column_a, <ls_line>-column_b. 
  endif.
endloop.

sy-tabix will give the line number where there is a difference between the 2 columns.