System Tables Views Oracle PLSQL

SQL>
SQL> create table t
  2   (c1 number primary key,
  3    c2 number not null )
  4  ;
Table created.
SQL>
SQL> create sequence s1;
Sequence created.
SQL>
SQL> insert into t values(s1.nextval, s1.nextval+10);
1 row created.
SQL> /
1 row created.
SQL> /
1 row created.
SQL> /
1 row created.
SQL> /
1 row created.
SQL> commit;
Commit complete.
SQL>
SQL> select object_id from user_objects where object_name = 'T';
     20955
1 row selected.
SQL>
SQL>
SQL> drop table t;
Table dropped.
SQL>
SQL> drop sequence s1;
Sequence dropped.