Please help ..........pl/sql help

Question

in my table there are some records. table have 2 column (id integer and word varchar2)
i want to concate words which having same id
eg
1, 'word1'
1, 'word2'
1, 'word3'
2, 'word4'
2, 'word5'
2, 'word6'
3, 'word7'
3, 'word8'
3, 'word9'
4, 'word10'
and i want o/p
1 word1, word2, word3
2 word4, word5, word6
3 word7, word8, word9
4 word10
any help will be appriciated

Answer 1

SQL> select * from test;
        ID VALUE
         1 word1
         1 word2
         1 word3
         2 word1
         2 word5
SQL> column c2 format a40
SQL>  select id,ltrim(max(sys_connect_by_path(value,',')),',') c2
  2   from(
  3     select id,value,row_number() over (partition by id order by value) rn
  4     from test
  5     )
  6   start with rn = 1
  7   connect by prior rn = rn - 1
  8   and prior id = id
  9   group by id
10  /
        ID C2
         1 word1,word2,word3
         2 word1,word5