{Urgent} Query Output

Question

Hi all,
I have the following simple table. I'm using the LISTAGG function.
The output of my query is :
100,200,300,400,500,600
102,302,602
403,503
If you notice for the id 2 and 3 there are missing data because they do not exist.
I would like the output to be :
100,200,300,400,500,600
102, ,302, ,602
, ,  ,403,503
Thank you
CREATE TABLE test
   id    INTEGER,
   yr    INTEGER,
   val   INTEGER
INSERT INTO test (id, yr, val)
     VALUES (1, 2005, 100);
INSERT INTO test (id, yr, val)
     VALUES (1, 2006, 200);
INSERT INTO test (id, yr, val)
     VALUES (1, 2007, 300);
INSERT INTO test (id, yr, val)
     VALUES (1, 2008, 400);
INSERT INTO test (id, yr, val)
     VALUES (1, 2009, 500);
INSERT INTO test (id, yr, val)
     VALUES (1, 2009, 600);
INSERT INTO test (id, yr, val)
     VALUES (2, 2005, 102);
INSERT INTO test (id, yr, val)
     VALUES (2, 2007, 302);
INSERT INTO test (id, yr, val)
     VALUES (2, 2009, 602);
INSERT INTO test (id, yr, val)
     VALUES (3, 2008, 403);
INSERT INTO test (id, yr, val)
     VALUES (3, 2009, 503);
  SELECT LISTAGG (val, ',') WITHIN GROUP (ORDER BY yr)
    FROM test
   WHERE YR BETWEEN 2005 AND 2010
GROUP BY id;

Answer 1

Maybe NOT TESTED! LISTAGG states: Null values in the measure column are ignored.
select listagg(decode(val,null,'_',to_char(val)),',') within group (order by yr) 
  from (select t.id,t.val,y.yr 
          from test t partition by (t.id) 
               right join 
               (select level + 2004 yr 
                  from dual 
                connect by level <= 6
               ) y 
            on y.yr = t.yr
group by id
Regards
Etbin