SUM STATEMENT

Question

HI GURU'S,
Please can anybody explains me
what is significance of using SUM statement inside the AT AND ENDAT statement.
what i understood about sum is: The statement SUM calculates the component total with the numeric data type (i, p, f)
of all rows in the current control level and assigns these to the components of the work area wa. In the control levels
FIRST, LAST, and outside of an AT-ENDAT control structure, the system calculates the sum of numeric components
of all rows in the internal table.
but in below program which i did, its not doing that</b>
TYPES: BEGIN OF companies_type,
        name(30),
        product(20),
        sales TYPE i,
        SALES1 TYPE I,
      END   OF companies_type.
DATA: companies TYPE STANDARD TABLE OF companies_type WITH
                     NON-UNIQUE DEFAULT KEY INITIAL SIZE 20,
      wa_companies TYPE companies_type.
wa_companies-name = 'XYZ'.
wa_companies-product = 'SAP'.
wa_companies-sales = '1'.
wa_companies-sales1 = '1'.
APPEND wa_companies TO companies.
wa_companies-name = 'ABC'.
wa_companies-product = 'ABAP'.
wa_companies-sales = '4'.
wa_companies-sales1 = '4'.
APPEND wa_companies TO companies.
wa_companies-name = 'PQR'.
wa_companies-product = 'HR'.
wa_companies-sales = '3'.
wa_companies-sales1 = '3'.
APPEND wa_companies TO companies.
LOOP AT companies INTO wa_companies.
  AT NEW name.
  sum.
    NEW-PAGE.
    WRITE / wa_companies-name.
  ENDAT.
  WRITE: / wa_companies-product, wa_companies-sales,wa_companies-sales1.
  AT END OF NAME.
    SUM.
    WRITE: / wa_companies-name, wa_companies-sales,wa_companies-sales1 .
  ENDAT.
ENDLOOP.
Thanks
Priya

Answer 1

Hi,
  The control statements should be used inside a loop, the internal table should be sorted before using the control statements.
loop...
At new name.
sum.
endat.
endloop....
Sum of the numeric values will be calculated when the name changes. At new  is triggered at the begining itself.
loop...
At end of name.
sum.
endat.
endloop....
  Sum of the numeric values will be calculated when the name changes .
Just a simple example:
ID no    Name    Salary.
100       Ram     5000
100       Ravi      6000
200       Prajn    7000
In this case.
loop at itab.
  At new idno.
     sum
  write:/ itab-idno , itab-name, itab-salaty.
Endat.
endloop.
O/p will be :
      100  Ram 11000
The sum will trigger when the number idno is changing .
Similarly AT end  also works.
Regards,
Vani