Single row query and convert

Question

greetings,
Data tables and intended output are on the bottom.
Process tables contains different store id that process the fabric. 1 single order will have 2 ( at most) or 1 different process store(s). Need to create a query list out all order no along with process store names , work. It also requires to convert each numeric fieldto 0 if null. I was able to create a query as the following but stuck on don't knwo how to make the order number listed as single row plus that numeric field conversion when there are 2 different process no . Can you help ? I know there are many gurus out here that can give me a lift. Thanks.
select
B.porderno,
decode(pprocessno,1,A.name,null) as "1st storename",
decode(pprocessno,2,A.name,null) as "2nd storename",
decode(pprocessno,1,nvl(B.plength,0),null) as "1st length",
decode(pprocessno,2,nvl(B.plength,0),null) as "2nd length"
from test_store2 A,test_process B
where A.storeid=B.pstoreid.....
CREATE TABLE test_store2
( storeid NUMBER(3,0) not null,
name VARCHAR2(20)not null,
addr VARCHAR2(30)not null
CREATE TABLE test_process
( porderno NUMBER(10,0) not null,
pstoreid number(3,0) not null,
pprocessno number(3,0) not null,
plength number(3,0),
pwork VARCHAR2(30)
INSERT INTO test_store2(storeid, name, addr)
VALUES (001, 'papas', '123 Road1')
INSERT INTO test_store2(storeid, name, addr)
VALUES (002, 'tcbi', '652 heaven st')
INSERT INTO test_store2(storeid, name, addr)
VALUES (003, 'tutu club', '888 big ave')
INSERT INTO test_store2(storeid, name, addr)
VALUES (004, 'stinkys', '432 bobo st')
INSERT INTO test_process(porderno, pstoreid,pprocessno,plength, pwork)
VALUES (811, 2,1,null,'prepNdye')
INSERT INTO test_process(porderno, pstoreid,pprocessno,plength, pwork)
VALUES (811, 1,2,30,'trimming')
INSERT INTO test_process(porderno, pstoreid,pprocessno,plength, pwork)
VALUES (812, 1,1,10,'dye')
INSERT INTO test_process(porderno, pstoreid,pprocessno,plength, pwork)
VALUES (813, 3,1,40, 'prep')
INSERT INTO test_process(porderno, pstoreid,pprocessno,plength, pwork)
VALUES (813, 4,2,null, 'dye')
look for result layout
order  1st storename 2nd storename      1st length    2ndlength         1stwork            2nd work
811     tcbi                papas             0             30            prepNdye           trimming
812     papas                                 10             0            dye
813     tutu club           stinks            40             0            prep               dye

Answer 1

Hi,
Please don't post unformatted code. If you want people to read you code, don't make it difficult for them
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In the query I posted,
AND     p2.pprocessno     = 2was part of the outer-join condition between p1 and (the optional) p2.
When using -notation, you need a sign after all references to columns from the table that could be missing (p2 in this case), so you should have siad:
where     (       p1.pstoreid   = s1.storeid
     and       p1.pprocessno = 1
and      (     p1.porderno       = p2.porderno (+)
     AND     p2.pprocessno (+) = 2              -- (+) sign needed here
and     (p2.pstoreid     = s2.storeid (+)         -- Cascading outer join
     )A rule of thumb: if any WHERE-clause reference to p2 has a -sign, then all references to p2 must have a -sign, otherwise the effect will be an inner join. There is one exception, a cascading outer join , where a another table (s2 in this case) is outer-joined to the optional table (p2). You can't have -signs on both sides of a condition.  In a cascading outer join, only the distal+ table (the one farther removed from the required table, p1 in this case) is marked with a +-sign.