Query with FULL OUTER JOIN , help pleaseeeeeeeeeeee...

Question

Hi everyone,
I'm trying to write a query for a report in Oracle SQL, but i just can't figure out how to do it.
I'm using Oracle 10g release 1.0 database and i execute my queris in SQL* PLUS ( eventually i'm gonna use them in Oracle Report Builder ) .
here's what i have:
i have four tables that are used for our inventory application. lets call them INCOMMING , INCOMMING_ITEMS , OUTGOING , OUTGOING_ITEMS.
as you may have guessed , INCOMMING_ITEMS is the detail table for INCOMMING ( joined by IID column) and also OUTGOING_ITEMS is the detail table for OUTGOING ( joined by OID column ).
here is the structure of them :
INCOMMING
IID varchar2
CDATE date
INCOMMING_ITEM
IID varchar2
PART_NO number
QTY number
OUTGOING
OID varchar2
CDATE date
OUTGOING_ITEM
OID varchar2
PART_NO number
QTY number
now , the query i want, should return part_no , cdate , sum of OUTGOING qty , sum of INCOMMING qty .
the result of the query should be sth like this :
part_no     cdate     O_qty     I_qty
100     01/05/06     10     0
100     01/05/07     20     60
200     01/06/02     0     50
300     01/06/02     30     40
this means that for some dates and for some parts, i may not have INCOMMING or OUTGOING data, but if at least one of the 2 last columns has a non-zero data, i should show the row ( like the first and third rows of my example result), and if both have data for the same PART_NO and the same CDATE, both should be showed in the same row. ( like the second row in my example result)
i tried so much and came up with several huge and also time consuming queries, but then i read abt FULL OUTER JOIN somewhere and tried using that. here is what i came up with :
SELECT
PART_NO , CDATE , sum(II.QTY) I_QTY , SUM (OI.QTY) O_QTY
FROM
     (OUTGOING O INNER JOIN OUTGOING_ITEM OI USING ( OID ) )
FULL OUTER JOIN
     (INCOMMING I INNER JOIN INCOMMING_ITEM II USING ( IID ) )
ON ( I.CDATE = O.CDATE AND II.PART_NO = OI.PART_NO)
WHERE
I.CDATE = :PARAMETER1
AND O.CDATE = :PARAMETER1
GROUP BY
PART_NO , CDATE
this query is short and fast , but the results r not what i expected. i mean, although i have used FULL OUTER JOIN in the query , but the results i get r sth like this :
part_no     cdate     O_qty     I_qty
100     01/05/07     20     60
300     01/06/02     30     40
which means only the rows that has both values are returned.
any change i make to this query would make the SQL* PLUS hang , like when i use the cartesian product of two large tables, so i guess my changes wheren't in the right direction.
i think its possible to write this query using FULL OUTER JOIN syntax, but i just can't find it.
Can anybody pleaseeeeeeeeeeeee help me?
thanx in advance,
Maryam.

Answer 1

Note: I wrote this on the fly -- hope there is no syntax errors, otherwise forgive me -- but you get the idea..
select
fromUnionAll.cdate, fromUnionAll.part_no,
sum(fromUnionAll.O_qty) O_qty,
sum(fromUnionAll.I_qty) I_qty
from
select
iinner.cdate, iinner.part_no, 0 O_qty, iinner.I_qty
from
select
i.cdate, ii.part_no,
/* added the case only for the extreme case when there is
no record anywhere for the given CDATE in INCOMMING_item */
sum( ( case when ii.qty is not null then ii.qty else 0 end) ) I_qty
from
incomming i,
incomming_item ii
where
i.iid = ii.iid (+)
group by i.cdate, ii.part_no
) iinner
union all
select
oinner.cdate, oinner.part_no, oinner.O_qty, 0 I_qty
from
select
o.cdate, oi.part_no,
/* added the case only for the extreme case when there is
no record anywhere for the given CDATE in OUTGOING_item */
sum( ( case when oi.qty is not null then oi.qty else 0 end) ) O_qty
from
outgoing o,
outgoing_item oi
where
o.oid = oi.oid (+)
group by o.cdate, oi.part_no
) oinner
) fromUnionAll
group by fromUnionAll.cdate, fromUnionAll.part_no;
--Samson