How to Refer an Internal Table's field by index

I have a internal table with 10 columns,
how can i refer the column with it's index.
something like field(1) or field(2) etc.
Thanks in Advance
Arun Kumar

Dear Durairaj Athavan Raja
You might be knowing, In HR, in the table PA0008, basic may stored in any of the field from BET01 to BET20.
This is based on the wage type , which is once again stored in LGA01 to LGA20.
if i want to get the basic of a particular employee,
i'll execute a query for pa0008,
select * from pa0008 into corresponding fields of taable itpa008 where pernr = '1234'.
if i am able to get the field value thro index of a field,
my cod will be
loop at itpa0008.
    if itpa0008-LGA(index) = '1001'.
      actbasic = itpa0008-BET(index).
    endif.
endloop.
now variable actbasic will have the basic of that particular employee.
orelse, i have to check from LGA01 to LGA20 manually using if statement.
How can i achive this.
thanks in advance
Arun

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