Compara cadenas ignorando acentos en SQL (ORACLE)

Configuración de Oracle :

CREATE TABLE TABLE_NAME ( value ) AS
SELECT 'pepé' FROM DUAL;

-- Not necessary to create an index but it can speed things up.
CREATE INDEX value_without_accent_idx
  ON TABLE_NAME ( CONVERT( value, 'US7ASCII' ) );

Consulta :

SELECT *
FROM   table_name
WHERE  CONVERT( value, 'US7ASCII' ) = 'pepe';

Salida :

VALUE
-----
pepé