Sample code and senarios to use outer join?

Question

We know the ABAP4 syntax for inner join, but never tried outer join and we even don't know if there is any outer join syntax in ABAP4 or not.  Would be very appreciated if some ABAP expert here let us know if there is any outer join and list the difference between inner join and outer join with detailed senarios or when we would use outer join or when to use inner join?  Also give a sample code on the outer join if there is any in ABAP?
Thanks and we will give you reward points!

Answer 1

Hye..
Left outer join between table 1 and table 2 where column D in both tables set the join condition:
Table 1                      Table 2
A
B
C
D
D
E
F
G
H
a1
b1
c1
1
1
e1
f1
g1
h1
a2
b2
c2
1
3
e2
f2
g2
h2
a3
b3
c3
2
4
e3
f3
g3
h3
a4
b4
c4
3
|--|||--|
    Left Outer Join
    |--||||||||--|
    | A  | B  | C  | D  | D  | E  | F  | G  | H  |
    |--||||||||--|
    | a1 | b1 | c1 | 1  | 1  | e1 | f1 | g1 | h1 |
    | a2 | b2 | c2 | 1  | 1  | e1 | f1 | g1 | h1 |
    | a3 | b3 | c3 | 2  |NULL|NULL|NULL|NULL|NULL|
    | a4 | b4 | c4 | 3  | 3  | e2 | f2 | g2 | h2 |
    |--||||||||--|
Example
Output a list of all custimers with their bookings for October 15th, 2001:
DATA: CUSTOMER TYPE SCUSTOM,
      BOOKING  TYPE SBOOK.
SELECT SCUSTOMNAME SCUSTOMPOSTCODE SCUSTOM~CITY
       SBOOKFLDATE SBOOKCARRID SBOOKCONNID SBOOKBOOKID
       INTO (CUSTOMER-NAME, CUSTOMER-POSTCODE, CUSTOMER-CITY,
             BOOKING-FLDATE, BOOKING-CARRID, BOOKING-CONNID,
             BOOKING-BOOKID)
       FROM SCUSTOM LEFT OUTER JOIN SBOOK
         ON SCUSTOMID = SBOOKCUSTOMID AND
            SBOOK~FLDATE = '20011015'
       ORDER BY SCUSTOMNAME SBOOKFLDATE.
  WRITE: / CUSTOMER-NAME, CUSTOMER-POSTCODE, CUSTOMER-CITY,
           BOOKING-FLDATE, BOOKING-CARRID, BOOKING-CONNID,
           BOOKING-BOOKID.
ENDSELECT.
Reward if helpful.
Thanks.
Imran.