Combining 2 seperate recordsets with related records

Question

What is the easiest to combine 2 seperate recordsets with related records?
The following example has two different recordsets F1 and F2 but are joined with F0.
Connected to:
Oracle9i Enterprise Edition Release 9.2.0.1.0 - Production
With the Partitioning, OLAP and Oracle Data Mining options
JServer Release 9.2.0.1.0 - Production
SQL> with t0 as
  2  (
  3     select 1 as id, 'Example 1' as f0 from dual union all
  4     select 2 as id, 'Example 2' as f0 from dual
  5  ),
  6  t1 as
  7  (
  8     select 1 as id, 'a' as f1 from dual union all
  9     select 1 as id, 'b' as f1 from dual union all
10     select 2 as id, 'aa' as f1 from dual union all
11     select 2 as id, 'bb' as f1 from dual union all
12     select 2 as id, 'cc' as f1 from dual union all
13     select 2 as id, 'dd' as f1 from dual
14  ),
15  t2 as
16  (
17     select 1 as id, 'x' as f2 from dual union all
18     select 1 as id, 'y' as f2 from dual union all
19     select 1 as id, 'z' as f2 from dual union all
20     select 2 as id, 'ww' as f2 from dual
21  )
22  select f0,f1,f2
23  from t0, t1, t2
24  where t0.id = t1.id
25  and t0.id = t2.id;
F0        F1 F2
Example 1 a  x
Example 1 b  x
Example 1 a  y
Example 1 b  y
Example 1 a  z
Example 1 b  z
Example 2 aa ww
Example 2 bb ww
Example 2 cc ww
Example 2 dd ww
10 rows selected.desired output:
F0        F1 F2
Example 1 a  x
Example 1 b  y
Example 1    z
Example 2 aa ww
Example 2 bb
Example 2 cc
Example 2 dd

Answer 1

I got it! One more question though, can this be done in a easier way? Like using xmlsequence, analytical functions or other tricks that I don't know about.
SQL> with t0 as
  2  (
  3     select 1 as id, 'Example 1' as f0 from dual union all
  4     select 2 as id, 'Example 2' as f0 from dual
  5  ),
  6  t1 as
  7  (
  8     select 1 as id, 'a' as f1 from dual union all
  9     select 1 as id, 'b' as f1 from dual union all
10     select 2 as id, 'aa' as f1 from dual union all
11     select 2 as id, 'bb' as f1 from dual union all
12     select 2 as id, 'cc' as f1 from dual union all
13     select 2 as id, 'dd' as f1 from dual
14  ),
15  t2 as
16  (
17     select 1 as id, 'x' as f2 from dual union all
18     select 1 as id, 'y' as f2 from dual union all
19     select 1 as id, 'z' as f2 from dual union all
20     select 2 as id, 'ww' as f2 from dual
21  )
22  select f0,f1,f2
23  from
24  (
25      select f0, rn,
26            max(case when f1 is null then null else f1 end) f1,
27            max(case when f2 is null then null else f2 end) f2
28      from
29      (
30          (
31              select f0, f1, null f2, row_number() over (partition by f0 order by null) rn
32              from t0, t1
33              where t0.id = t1.id
34          )
35          union all
36          (
37              select f0, null f1, f2, row_number() over (partition by f0 order by null) rn
38              from t0, t2
39              where t0.id = t2.id
40          )
41      )
42      group by f0, rn
43  );
F0        F1 F2
Example 1 a  x
Example 1 b  y
Example 1    z
Example 2 aa ww
Example 2 bb
Example 2 cc
Example 2 dd
7 rows selected.