LOOP inside loop -performance issue.

Question

hi ppl,
I want to put the select query mentioned below outside the loop to resolve performance issue. The 'for all entries' does not support aggregate functions like 'sum' and 'group by'. plz have a look at my approach and suggest some changes.
the code:
LOOP AT T_UNITS.
V_TABIX = SY-TABIX.
CONCATENATE TEXT-S01 T_UNITS-UNIT INTO VL_TEXT SEPARATED BY ' '.
CALL FUNCTION 'SAPGUI_PROGRESS_INDICATOR'
EXPORTING
PERCENTAGE = 0
TEXT = VL_TEXT.
get GLPCA postings
SELECT AWTYP AWORG RACCT REFDOCNR SUM( HSL ) FROM GLPCA "1062
INTO TABLE T_GLPCA
WHERE RPRCTR = T_UNITS-UNIT
AND RACCT IN S_HKONT
AND KOKRS = V_KOKRS
AND RYEAR = P_GJAHR
AND POPER <= P_MONAT
GROUP BY AWTYP AWORG RACCT REFDOCNR.
lopp at t_glpca.
endloop.
endloop.
my approach:
all this put outside the loop 'loop at t_units'.
SELECT rprctr AWTYP AWORG RACCT REFDOCNR HSL FROM GLPCA  "1062
  INTO TABLE T_GLPCA
  For all entries in t_units            
   WHERE RPRCTR = T_UNITS-UNIT
   AND   RACCT  IN S_HKONT
   AND   KOKRS = V_KOKRS
   AND   RYEAR = P_GJAHR
   AND   POPER  <= P_MONAT.
loop at t_glpca.
    v_tabix = sy-tabix.
    select sum( hsl ) from glpca into t_glpca-hsl.
    modify t_glpca index v_tabix.
  endloop.
The select query 'select sum( hsl ) from glpca into t_glpca-hsl' is consuming lot of time.
thanks in advance
Archana

Answer 1

hi ,
    u can use sum function while displaying also .
u have selected some values into itab na .aftyer that use the below code.
loop at itab.
at end of <fielname>.
sum.
write:/ itab-<fieldname>.
endat.
like this also u can some .so u can use for all entries in select statement .
hopw it's usefull for u .
or use
on change of <fielname>
endon.
instead of at endof.
EXAMPLE CODE
SELECT *
       FROM sflight
       INTO TABLE sflight_tab.
LOOP AT sflight_tab INTO sflight_wa.
  AT NEW connid.
    WRITE: / sflight_wa-carrid,
             sflight_wa-connid.
    ULINE.
  ENDAT.
  WRITE: / sflight_wa-fldate,
           sflight_wa-seatsocc.
  AT END OF connid.
    SUM.
    ULINE.
    WRITE: / 'Sum',
              sflight_wa-seatsocc UNDER sflight_wa-seatsocc.
    SKIP.
  ENDAT.