In a schema HR (deployed when i installed Oracle 10g rel. 2), i run this statement:
SQL> select segment_name from user_segments where segment_type='TABLE';

and the result is:
SEGMENT_NAME
------------------------------------------------------------------------
REGIONS
LOCATIONS
DEPARTMENTS
JOBS
EMPLOYEES
JOB_HISTORY

Selezionate 6 righe.

If I run this statement:
SQL> select table_name from user_tables;

instead, the result is:
TABLE_NAME
------------------------------
REGIONS
LOCATIONS
DEPARTMENTS
JOBS
EMPLOYEES
JOB_HISTORY
COUNTRIES

Selezionate 7 righe.

Why i don't see COUNTRIES table in USER_SEGMENTS ?

Regards,
Dave