How to select and sum internal table records

Question

Dear Friends
I kindly ask you if we have select statement
   if s_mtart = 'z003'
      select single pvprs from ckmlcr into ckmlcr-pvprs
where poper EQ s_poper and
      kalnr = itab2-kalnr  and
      bdatj = itab2-bdatj and
      curtp = itab2-curtp.
like this how can I calculate how many record it got and I want to get summation of this field(pvprs).And for all poper's must contain.
  Please  Let me remind you my itab is already open I didn't put any thing for this situation

Answer 1

it seems to be you written this SELECT in a loop. if so,
instead of pushing the values into ckmlcr-pvprs ,create an internal table
data : begin of itab,
     pvprs  type ckmlcr-pvprs ,
    end of itab.
then just after that SELECT SINGLE,
select single pvprs from ckmlcr <b>into ITAB-pvprs</b>
where poper EQ s_poper and
kalnr = itab2-kalnr and
bdatj = itab2-bdatj and
curtp = itab2-curtp.
IF SY-SUBRC = 0.
  APPEND ITAB.
here either you can use APPEND OR COLLECT.
If you use COLLECT,all the values will get summed up and final sum will be in the table ITAB-pvprs.
ENDIF.
After all loops your itab will have the totals.
DESCRIBE TABLE ITAB LINES V_LINES.
V_LINES Will have total no of lines.
Regards
srikanth