Compare and replace.

[Former Member]

hello all,

I have an internal table with the following output.

A B

1 2

3 4

5 6

2 7

7 10

Now i have to compare these two columns.

ex: for field B the first record is 2 we have to check whether 2 is present in A .

we can see 2 is present in A now for that entry the related entry in B is 7.Again we have to check whether 7 is present in A .we can see 7 is there in A for this entry the related entry is 10.

like this we have to compare for the whole table .

Here 10 is the last entry now we have to replace as,

A B

1 10

3 4

5 6

2 10

7 10

Regards,

Vaasu.

[Former Member]

Hi,

Try this logic,

data bvalue type itab-b.

data bvalue type itab-b.

data tabix type sy-tabix.

data flag type c.

Loop at itab.

bvalue = itab-b.

tabix = sy-tabix.

do.

read table itab into wa_itab with key a = bvalue.

if sy-subrc eq 0.

bvalue = wa_itab-b.

flag = 'X'.

ENDIF.

ELSE.

exit.

enddo.

if flag eq 'X'.

itab-b = bvalue.

modify itab index tabix.

endif.

endloop.

[Former Member]

i = 2.   "Store the initial value to be checked in column B
DO.
   READ TABLE itab INTO wa_itab WITH KEY b = i.
   IF SY-SUBRC = 0. "If value found in Column B
       wa_index-index = sy-tabix.
       append wa_index to it_bindex.   "Store the index of Row in another internal table
       clear wa_index.
       j = wa_itab-a. "Set the value to be checked in Column A
      READ TABLE itab INTO wa_itab1 WITH KEY a = j. "Read table for checking Column A
      IF SY-SUBRC = 0. " If value found in column A
         wa_index-index = sy-tabix.
         append wa_index to it_aindex. " Store the index in another table for future use
         clear wa_index.
          i = wa_itab1-b. 'Change value to be checked in Column B
      ELSE.
          a_flag = 'X'. "If Value not found in Column A set the flag and Exit
          EXIT.                  
      ENDIF.
   ELSE.
     b_flag = 'X'. "If Value not found in Column B set the flag and Exit
     EXIT.
   ENDIF.
ENDDO.

IF a_flag = 'X'. "If check failed in A column, change the latest B column value in all rows identified earlier
   LOOP AT it_bindex INTO wa_index.
      wa_itab-b = j.
      MODIFY itab FROM wa_itab INDEX wa_index-index.
   ENDLOOP.
ELSE. "If check failed in B column, change the latest A column value in all rows identified earlier
  LOOP AT it_aindex INTO wa_index.
      wa_itab-a = i.
      MODIFY itab FROM wa_itab INDEX wa_index-index.
   ENDLOOP.
ENDIF.

Hope this is clear.

Thanks,

Lakshmi

[Former Member]

Hi Vaasu,

The following snippet will work for your requirement.

Here it_tab is your table with fields A and B,

wa_tab,wa_tab1 work area for the table,

ty_tab structure of tabe it_tab.

Declare variable for holding B value like this

DATA: w_hold TYPE ty_tab-b.

then implement the following logic,

LOOP AT it_tab INTO wa_tab.
* Copying current B value to a variable
  w_hold = wa_tab-b.

  DO.
    READ TABLE it_tab INTO wa_tab1 WITH KEY a = w_hold .
    IF sy-subrc = 0.
* If entry exists change w_hold vale to current B value
      w_hold = wa_tab1-b.
    ELSE.
* If no entry exists come out of the loop
      EXIT.
    ENDIF.
  ENDDO.

* If w_hold value is not the initial B value then assign w_hold to B
  IF w_hold NE wa_tab-b.
    wa_tab-b = w_hold.
    MODIFY it_tab FROM wa_tab.
  ENDIF.
ENDLOOP.

Hope this will help you.

Regards,

Manoj Kumar P

[Former Member]

TYPES : BEGIN of type,

a(2) TYPE c,

b(2) TYPE c,

END OF type.

DATA : itab TYPE TABLE OF type WITH HEADER LINE.

DATA : tabix TYPE sy-tabix,

wa_b(2) TYPE c.

itab-a = 1. itab-b = 2. APPEND itab.

itab-a = 3. itab-b = 4. APPEND itab.

itab-a = 5. itab-b = 6. APPEND itab.

itab-a = 2. itab-b = 7. APPEND itab.

itab-a = 7. itab-b = 10. APPEND itab.

LOOP AT itab.

wa_b = itab-b.

tabix = sy-tabix.

do.

READ TABLE itab WITH KEY a = wa_b.

IF sy-subrc = 0.

wa_b = itab-b.

continue.

ELSE.

MODIFY itab INDEX tabix TRANSPORTING b .

EXIT.

ENDIF.

enddo.

ENDLOOP.

LOOP AT itab.

write: / itab-a, '--',itab-b.

ENDLOOP.

This piece of code will work for you.Specifically for ur example u can test.