Difference Between SY-TABIX and SY-INDEX in SAP ABAP

SY-TABIX, SY-INDEX :

Let’s begin with a test program.

Sample Program:

REPORT ztest_index_tabix.
TYPES: BEGIN OF ty_tab,
        id TYPE i,
       END OF ty_tab.
DATA: i_tab TYPE STANDARD TABLE OF ty_tab INITIAL SIZE 0,
      k_tab TYPE ty_tab,
      v_indx TYPE i.

k_tab-id = 1.
APPEND k_tab TO i_tab.

k_tab-id = 2.
APPEND k_tab TO i_tab.

k_tab-id = 3.
APPEND k_tab TO i_tab.

LOOP AT i_tab INTO k_tab.
  WRITE:/ 'Before Read statement'.
  WRITE:/ 'sy-tabix', sy-tabix,
          'sy-index', sy-index.

  READ TABLE i_tab INTO k_tab INDEX 2.
  WRITE:/ 'After Read statement'.
  WRITE:/ 'sy-tabix', sy-tabix,
          'sy-index', sy-index.
  WRITE:/ '+++++++++++++++++++++++++++++++++++'.
ENDLOOP.





DO 3 TIMES.
  WRITE:/ 'Before Read statement'.
  WRITE:/ 'sy-tabix', sy-tabix,
          'sy-index', sy-index.

  READ TABLE i_tab INTO k_tab INDEX 2.
  WRITE:/ 'After Read statement'.
  WRITE:/ 'sy-tabix', sy-tabix,
          'sy-index', sy-index.
  WRITE:/ '+++++++++++++++++++++++++++++++++++'.
ENDDO.

Output:

Conclusion: 

In LOOP / ENDLOOP -

SY-INDEX will never work.

SY-TABIX always holds the current executing record’s index for both the LOOP 

and READ statement.

Conclusion:

In DO / ENDDO –

SY-INDEX holds the current executing record’s index only for the DO / WHILE loop and NOT for the READ statement.

SY-TABIX can be used for the READ statement only.