SQL> create table test(c1 varchar2(10));

Table created

SQL> insert into test
2 values(chr(77)||chr(205)||chr(113)||chr(241));

1 row inserted

SQL> select c1 from test;

C1
----------
MMqq

SQL> commit;

Commit complete

SQL> select dump(c1) from test;

DUMP(C1)
--------------------------------------------------------------------------------
Typ=1 Len=4: 77,205,113,241

SQL> select * from test where c1='MMqq';

C1
----------

SQL> select *
2 from nls_database_parameters
3 where parameter = 'NLS_CHARACTERSET';

PARAMETER VALUE
------------------------------ ----------------------------------------
NLS_CHARACTERSET US7ASCII

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