Multiple rows in a single column in a SQL statement

Question

Can anyone provide me with a simple sql which will run on the below table (USERROLE table)
ID ROLEUSER ROLENAME
1 user1 GL
2 user2 OBI_AP
3 user1 OBI_AP
4 user2 GL
5 user1 OBI_AR
6 user2 AR
7 user3 GL
and give the result as
ROLEUSER ROLENAMES
user1 GL;OBI_AP;OBI_AR
user2 OBI_AP;GL;AR
user3 GL
Thanks
Vikram

Answer 1

In 10g,
satyaki>
satyaki>select * from v$version;
BANNER
Oracle Database 10g Enterprise Edition Release 10.2.0.3.0 - Prod
PL/SQL Release 10.2.0.3.0 - Production
CORE    10.2.0.3.0      Production
TNS for 32-bit Windows: Version 10.2.0.3.0 - Production
NLSRTL Version 10.2.0.3.0 - Production
Elapsed: 00:00:01.12
satyaki>
satyaki>
satyaki>with t2
  2  as
  3    (
  4      select 1 id, 'user1' ROLEUSER, 'GL' ROLENAME  from dual
  5      union all
  6      select 2, 'user2', 'OBI_AP' from dual
  7      union all
  8      select 3, 'user1', 'OBI_AP' from dual
  9      union all
10      select 4, 'user2', 'GL' from dual
11      union all
12      select 5, 'user1', 'OBI_AR' from dual
13      union all
14      select 6, 'user2', 'AR' from dual
15      union all
16      select 7, 'user3', 'GL' from dual
17    )
18  select ROLEUSER ,
19         substr( string, 2 ) as string
20  from dual
21  where 1 = 2
22   model
23     reference t_ref
24     on
25      (
26          select row_number() over ( order by id ) - 1 as row_num ,
27                 count(*) over () - 1 as max_row_num ,
28                 ROLEUSER ,
29                 ROLENAME
30          from t2
31          where ROLENAME is not null
32          order by ROLENAME
33     )
34    dimension by( row_num )
35    measures ( max_row_num, ROLEUSER, ROLENAME )
36    main t_main
37    dimension by ( cast( null as varchar2(4000) ) as ROLEUSER )
38    measures ( cast( null as varchar2(4000) ) as string )
39     rules
40     iterate( 4294967295 )
41     until
42       (
43          t_ref.max_row_num[0] is null or
44          iteration_number >= t_ref.max_row_num[0]
45       )
46       (
47          string[ t_ref.ROLEUSER[iteration_number] ] = string[ cv() ] || ';' ||
48          t_ref.ROLENAME[ iteration_number ]
49       )
50  order by 1;
ROLEUSER               STRING
user1                       GL;OBI_AP;OBI_AR
user2                       OBI_AP;GL;AR
user3                       GL
Elapsed: 00:00:00.26
satyaki>Regards.
Satyaki De.