Diff between inner&nbs…

To keep it simple, let me keep it this way:
Considering two table A and B and internal table ITAB: Inner Join:
It requires an entry with KEY of A in B, to be extracted to
internal table. Outer Join: Irrespective of whether an entry
exists  or not in B it still extracts data from A.
Eg:

Table: A

--------

 

Fld1    
Fld2

------------

X    
100

Y    
200

Z    
300

 

Table: B

--------

 

Fld1    
Fld3

------------

X    
abc

X    
def

Z    
pqr         
" No entry for Key Y in table B so it is not extracted

 

 

ITAB fields: FLD1, FLD2, FLD3

 

Inner Join:

-----------

 

FLD1    
FLD2    
FLD3

--------------------

X    
100    
abc

X    
100    
def

Z    
300    
pqr

 

Outer Join:

-----------

 

FLD1    
FLD2    
FLD3

--------------------

X    
100    
abc

X    
100    
def

Y    
200         
" No entry for Key Y in table B so FLD3 is blank

Z    
300    
pqr