translate and accent characters

Why doesn't the translate function work in this statement?

select 231 decimal_,

       to_char(231, 'xxxx') hex_,
	   chr(231) character_,
	   nvl(translate(chr(231), chr(231), 'c'), 'NULL!') translation

  DECIMAL_ HEX_ CHARACTER_ TRANSLATION
---------- ----- ---------- -----------

       231 e7 � NULL!

1 row selected

Thanks! Received on Tue Feb 04 2003 - 17:01:31 CET