Distinct distribution query

Question

Hi all,
I have the next records table example:
WITH taba
     AS (SELECT 2000 AS id, 'ORDEM' AS name, 'FILEA' AS description FROM DUAL
         UNION ALL
         SELECT 2000 AS id, 'ORDEM' AS name, 'FILEB' AS description FROM DUAL
         UNION ALL
         SELECT 2000 AS id, 'ORDEM' AS name, 'FILEC' AS description FROM DUAL
         UNION ALL
         SELECT 2001 AS id, 'ORDEM' AS name, 'FILEA' AS description FROM DUAL
         UNION ALL
         SELECT 2001 AS id, 'ORDEM' AS name, 'FILEB' AS description FROM DUAL
         UNION ALL
         SELECT 2001 AS id, 'ORDEM' AS name, 'FILEC' AS description FROM DUAL
         UNION ALL
         SELECT 2002 AS id, 'ORDEM' AS name, 'FILEA' AS description FROM DUAL
         UNION ALL
         SELECT 2002 AS id, 'ORDEM' AS name, 'FILEB' AS description FROM DUAL
         UNION ALL
         SELECT 2002 AS id, 'ORDEM' AS name, 'FILEC' AS description FROM DUAL)
SELECT *
  FROM tabaI need a query that distribute the DESCRIPTION column just once in each ID, like this:
ID     NAME     DESCRIPTION
2000   ORDEM     FILEA
2001   ORDEM     FILEB
2002   ORDEM     FILECIs indifferent if each ID have FILEA, B or C. I just need once DESCRIPTION per ID. This is other possible solution:
ID     NAME     DESCRIPTION
2000   ORDEM     FILEB
2001   ORDEM     FILEA
2002   ORDEM     FILECNotes: My table have more diferent records with diferent ID's, NAMES or DESCRIPTION.
What I need is: for each pair ID, NAME, I have just one DESCRIPTION
I have tried using OVER PARTITION clause but with bad results.
Anyone can help me?
Thanks in advance.
Regards,
Filipe Almeida

Answer 1

It is not clear if all IDs have same set of names/descriptions. For starters:
WITH taba
     AS (SELECT 2000 AS id, 'ORDEM' AS name, 'FILEA' AS description FROM DUAL
         UNION ALL
         SELECT 2000 AS id, 'ORDEM' AS name, 'FILEB' AS description FROM DUAL
         UNION ALL
         SELECT 2000 AS id, 'ORDEM' AS name, 'FILEC' AS description FROM DUAL
         UNION ALL
         SELECT 2001 AS id, 'ORDEM' AS name, 'FILEA' AS description FROM DUAL
         UNION ALL
         SELECT 2001 AS id, 'ORDEM' AS name, 'FILEB' AS description FROM DUAL
         UNION ALL
         SELECT 2001 AS id, 'ORDEM' AS name, 'FILEC' AS description FROM DUAL
         UNION ALL
         SELECT 2002 AS id, 'ORDEM' AS name, 'FILEA' AS description FROM DUAL
         UNION ALL
         SELECT 2002 AS id, 'ORDEM' AS name, 'FILEB' AS description FROM DUAL
         UNION ALL
         SELECT 2002 AS id, 'ORDEM' AS name, 'FILEC' AS description FROM DUAL
SELECT  id,
        name,
        description
   FROM (
         SELECT  t.*,
                 DENSE_RANK() OVER(ORDER BY id) rnk1,
                 DENSE_RANK() OVER(ORDER BY description) rnk2
           FROM  taba t
  WHERE rnk1 = rnk2
        ID NAME  DESCR
      2000 ORDEM FILEA
      2001 ORDEM FILEB
      2002 ORDEM FILEC
SQL> SY.