table not show tablespace_name

Dear all,

I have problem with some tables that don't show the tablespace_name, but it show from user_segments.

Please tell me what is the problem.

SQL> col tbl format a20

SQL> col tbs format a30

SQL> select TABLE_NAME tbl,TABLESPACE_NAME tbs from USER_TABLES where table_name in ('COSTS','PRODUCTS');

TBL                   TBS

-------------------- ------------------------------

PRODUCTS       EXAMPLE

COSTS

SQL> select distinct segment_name tbl, tablespace_name tbs from user_segments where segment_name in ('COSTS','PRODUCTS');

TBL                   TBS

-------------------- ------------------------------

PRODUCTS       EXAMPLE

COSTS               EXAMPLE

Best regards,

Kosal