Internal table operations

Question

Hi all,
   Please tell me the alternative of using loop that is specified in Bold. some body saying that is an alternative of using some statement without using loop in loop.
* data declaration
DATA: BEGIN OF T1 OCCURS 0,
F1 TYPE I,
END OF T1.
DATA: BEGIN OF T2 OCCURS 0,
F1 TYPE I,
F2(10) TYPE C,
END OF T2.
DATA: T3 LIKE T2 OCCURS 0 WITH HEADER LINE.
* fill internal table T1
T1-F1 =  10.
APPEND T1.
T1-F1 =  20.
APPEND T1.
T1-F1 =  30.
APPEND T1.
T1-F1 =  40.
APPEND T1.
* fill internal table T2
T2-F1 =  10.
T2-F2 = 'AA'.
APPEND T2.
T2-F1 =  10.
T2-F2 = 'AB'.
APPEND T2.
T2-F1 =  10.
T2-F2 = 'AC'.
APPEND T2.
T2-F1 =  20.
T2-F2 = 'BA'.
APPEND T2.
T2-F1 =  20.
T2-F2 = 'BB'.
APPEND T2.
T2-F1 =  30.
T2-F2 = 'CA'.
APPEND T2.
T2-F1 =  30.
T2-F2 = 'CB'.
APPEND T2.
T2-F1 =  30.
T2-F2 = 'CC'.
APPEND T2.
T2-F1 =  40.
T2-F2 = 'DA'.
APPEND T2.
CLEAR: T1, T2.
* fill internal table T1
LOOP AT T1.
<b>  LOOP AT T2 WHERE F1 = T1-F1.
    APPEND T2 TO T3.
  ENDLOOP.</b>
ENDLOOP.
* display internal table T1
LOOP AT T3.
  WRITE:/ T3-F1, T3-F2.
ENDLOOP.

Answer 1

HI
   I guess for this case, there is no alternative statements as you have data in two internal tables. But
YES you can minimise during extraction via FOR ALL ENTRIES.
Eg:
tables: mara.
select-options: s_matnr for mara-matnr.
types: begin of t_mara,
         matnr like mara-matnr,
         mtart like mara-mtart,
       end of t_mara.
types: begin of t_marc,
         matnr like marc-matnr,
         werks like marc-werks,
       end of t_marc.
data: it_mara type standard table of t_mara,
      it_marc type standard table of t_marc.
select matnr mtart into table it_mara
       from mara
       where matnr in s_matnr.
select matnr werks into table it_marc
       from marc
       for all entries in it_mara
       where matnr = it_mara-matnr.
Kind Regards
Eswar