How to update unique number to records coming under 1 Hierarchy?

Question

Hi,
I have the below table ,
CREATE TABLE  TEMP2
  ID        NUMBER,
  MATCH_ID  NUMBER,
  UniqueID    NUMBER
below records available in the table temp2,
ID     MATCH_ID     UNIQUEID
1     2     
1     3     
1     4     
2     5     
3     7     
5     9     
10     11     
12     13     
SET DEFINE OFF;
Insert into TEMP2
   (ID, MATCH_ID, UNIQUEID)
Values
   (1, 2, NULL);
Insert into TEMP2
   (ID, MATCH_ID, UNIQUEID)
Values
   (1, 3, NULL);
Insert into TEMP2
   (ID, MATCH_ID, UNIQUEID)
Values
   (1, 4, NULL);
Insert into TEMP2
   (ID, MATCH_ID, UNIQUEID)
Values
   (2, 5, NULL);
Insert into TEMP2
   (ID, MATCH_ID, UNIQUEID)
Values
   (3, 7, NULL);
Insert into TEMP2
   (ID, MATCH_ID, UNIQUEID)
Values
   (5, 9, NULL);
Insert into TEMP2
   (ID, MATCH_ID, UNIQUEID)
Values
   (10, 11, NULL);
Insert into TEMP2
   (ID, MATCH_ID, UNIQUEID)
Values
   (12, 13, NULL);
COMMIT;
requirement :
id 1 is matching with matchID 2,3,4 and 2 is matching with 5 and 3 is matching with 7 and 5 is matching with 9
here I want to give one unique sequnce to all the related hierarchy records,
How can i do this?
my output should like this,
ID     MATCH_ID     UNIQUEID
1     2     1
1     3     1
1     4     1
2     5     1
3     7     1
5     9     1
10     11     2
12     13     3
Any help appriciated..

Answer 1

You want something like this?
SQL> ed
Wrote file afiedt.buf
  1  select id, match_id, dense_rank() over (order by par_id) as rnk
  2  from (
  3        select id, match_id, connect_by_root(id) as par_id
  4        from   temp2
  5        connect by nocycle id = prior match_id
  6  --      start with id not in (select match_id from temp2)
  7       )
  8* order by rnk
SQL> /
        ID   MATCH_ID        RNK
612646357  612663043          1
612663043  612646357          1
612646600  612673275          2
612673275  612646600          2
612646602  612660746          3
612660746  612646602          3
612646816  612661509          4
612661509  612646816          4
612660746  612646602          5
612646602  612660746          5
612661509  612646816          6
612646816  612661509          6
612663043  612646357          7
612646357  612663043          7
612673275  612646600          8
612646600  612673275          8
16 rows selected.