How to find out if colums is defined as VARCHAR2 in bytes or char?

Question

Hello,
I'd like to know if it is possible to find out if a colum table (or view) is defined as a VARCHAR2 in bytes or in CHAR on Oracle 10g.
When I do a desc, it shows only VARCHAR2 with its length but not if it is bytes or char. How can I know for sure?
Thanks,

Answer 1

SQL> create table t
  id    varchar2 (10 char),
  id2   varchar2 (10 byte)
Table created.
SQL> select column_name, data_type, char_used
  from cols
where table_name = 'T'
COLUMN_NAME                                   DATA_TYPE       CHAR_USED
ID                                            VARCHAR2        C       
ID2                                           VARCHAR2        B       
2 rows selected.