Usar Trim
Función
select Trim(trailing ' ' from 'xxxxxxxxxx yyyyyyyyy - 12/7/14 - 12/13/14 ') from dual
o Usar Rtrim
select RTrim('xxxxxxxxxx yyyyyyyyy - 12/7/14 - 12/13/14 ') from dual
Usar Trim
Función
select Trim(trailing ' ' from 'xxxxxxxxxx yyyyyyyyy - 12/7/14 - 12/13/14 ') from dual
o Usar Rtrim
select RTrim('xxxxxxxxxx yyyyyyyyy - 12/7/14 - 12/13/14 ') from dual