ABAP Sample Query "For All Entries In MM01"

REPORT ztest.
tables:mara,marc,mard,makt.
data:begin of it_mara occurs 0,
matnr like mara-matnr,
mtart like mara-mtart,
meins like mara-meins,
end of it_mara.

data:begin of it_marc occurs 0,
matnr like marc-matnr,
pstat like marc-pstat,
werks like marc-werks,
end of it_marc.

data:begin of it_mard occurs 0,
werks like mard-werks,
lgort like mard-lgort,
labst like mard-labst,
end of it_mard.

data:begin of it_final occurs 0,
matnr like mara-matnr,
mtart like mara-mtart,
meins like mara-meins,
pstat like marc-pstat,
werks like marc-werks,
lgort like mard-lgort,
labst like mard-labst,
maktx like makt-maktx,
end of it_final.

select-options:s_matnr for mara-matnr.

select matnr
mtart
meins
from mara
into table it_mara
where matnr in s_matnr.
if not it_mara[] is initial.
select
matnr
pstat
werks
from marc
into table it_marc
for all entries in it_mara
where matnr = it_mara-matnr.
if not it_marc[] is initial.
select werks
lgort
labst
from mard
into table it_mard
for all entries in it_marc
where werks = it_marc-werks.
endif.
endif.
loop at it_mara.
it_final-matnr = it_mara-matnr.
it_final-mtart = it_mara-mtart.
it_final-meins = it_mara-meins.
read table it_marc with key matnr = it_mara-matnr.
it_final-werks = it_marc-werks.
it_final-pstat = it_marc-pstat.
read table it_mard with key werks = it_marc-werks.
it_final-lgort = it_mard-lgort.
it_final-labst = it_mard-labst.
if sy-subrc = 0.
select maktx from makt into it_final-maktx where matnr = it_final-matnr.
endselect.
endif.
append it_final.
endloop.

loop at it_final.
write:/ it_final-matnr under 'material',
it_final-mtart under 'material type',
it_final-meins under 'unit of measure',
it_final-werks under 'plant' ,
it_final-pstat under 'status',
it_final-lgort under 'storage loc',
it_final-labst under 'stock',
it_final-maktx.
endloop.