Doubt in Inner Join.

Question

Hi all,
In a report program i have used a inner join. I am getting error in the where condition. Here I have furnished part of my code for ur reference.
Tables : mara, makt, mard.
data : begin of itab occurs 0,
matnr like mara-matnr,
maktx like makt-maktx,
lgort like mard-lgort,
labst like mard-labst,
end of itab.
parameters : matnr like mara-matnr.
start-of-selection.
select maramatnr maktmaktx mardlgort mardlabst into corresponding fields of iab from mara inner join maktx on maramatnr = maktmatnr inner join mard on maktmatnr = mardmatnr where matnr eq matnr.
in the where condition I am getting the following error message.
matnr has two meanings in data dictionary.
Please help me in sort out this problem and also tell me more abt inner joins.
thanks.

Answer 1

HI,
You can achieve this in two ways:
1st:
into corresponding fields of TABLE itab
2nd:
if you have inner join you don't need where any more at all! you already have connections.
if you still need then use:
tablename~fieldname
for both sides!
if in your example matnr from left side is local or global variable then you have problem with some naming conventions which usually are used in SAP.
try 1st points at the beggining
i'd write your select in this style
Code:
         select mara~matnr
          makt~maktx
          mardlgort mardlabst
into corresponding fields of table itab
from ( mara
inner join makt on maktmatnr = maramatnr
               and makt~spras = sy-langu )
inner join mard on mardmatnr = maramatnr.
OR
    Code:
          select mara~matnr
          makt~maktx
          mardlgort mardlabst
into corresponding fields of table itab
from ( mara
inner join makt on maktmatnr = maramatnr )
inner join mard on mardmatnr = maramatnr
where
        makt~spras = sy-langu.
Cheers,
Chandra Sekhar.