Distinto de valores CSV usando REGEXP

Você pode usar coleções de Oracles. CAST() emparelhado com COLLECT() pode agregar valores em uma coleção definida pelo usuário e então SET() vai se livrar das duplicatas. Então você pode usar LISTAGG() para converter a coleção em uma string.

Configuração do Oracle :

CREATE TYPE intlist IS TABLE OF INT;
/

CREATE TYPE stringlist IS TABLE OF VARCHAR2(4000);
/

CREATE TABLE table_name ( ColA NUMBER(5,0), ColB VARCHAR2(20) );
INSERT INTO table_name
  SELECT 1, 'POW' FROM DUAL UNION ALL
  SELECT 2, 'POW' FROM DUAL UNION ALL
  SELECT 1, 'POWPRO' FROM DUAL UNION ALL
  SELECT 1, 'PRO' FROM DUAL UNION ALL
  SELECT 2, 'PRO' FROM DUAL UNION ALL
  SELECT 1, 'PROUTL' FROM DUAL UNION ALL
  SELECT 1, 'TNEUTL' FROM DUAL UNION ALL
  SELECT 1, 'UTL' FROM DUAL UNION ALL
  SELECT 1, 'UTLTNE' FROM DUAL;

Consulta :

SELECT ( SELECT LISTAGG( COLUMN_VALUE, ',' )
                  WITHIN GROUP ( ORDER BY COLUMN_VALUE )
         FROM   TABLE( ColA ) ) AS ColA,
       ( SELECT LISTAGG( COLUMN_VALUE, ',' )
                  WITHIN GROUP ( ORDER BY COLUMN_VALUE )
         FROM   TABLE( ColB ) ) AS ColB  
FROM   (
  SELECT SET( CAST( COLLECT( ColA ORDER BY ColA ) AS INTLIST ) ) ColA,
         SET( CAST( COLLECT( ColB ORDER BY ColB ) AS STRINGLIST ) ) ColB
  FROM   table_name
);

Saída :

ColA ColB
---- ---------------------------------------
1,2  POW,POWPRO,PRO,PROUTL,TNEUTL,UTL,UTLTNE

Distinto de valores CSV usando REGEXP_REPLACE no oracle