Wat is the use of "DATA var-name LIKE SY-INDEX" statement

Hi to all,
       is there any use of "DATA <var-name> LIKE SY-INDEX" statement in ABAP, do the variable <var-name> be changed with that of SY-INDEX when we declare like this.
         Could u give me a fast response,
                                        Thank you,
                                             Srinivasa Rao k.

hi check this example..
data: v_index type sy-index value 10 .
do 15 times .
if sy-index = v_index .
write:/ 'the system index is 10 '.
exit.
endif.
enddo.
the main use of the index is used in the hr programs..
the user wants the emp salary and previous months salary then you need to use the index .
if the table had 10 records .then you need to catch the record of index1(current) and index 2(for previous month)..
select pernr ansal from pa0008 into table it_pa0008 where pernr in s_pernr and begda in s_begda .
loop at it_pa0008.
case sytabix.
when 1 .
it_final-cursal = it_pa0008-ansal.
when 2 .
it_final-prevsal = it_pa0008-ansal.
endcase .
endloop.
regards,
venkat.

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