oracle dba user all三种类型的系统对象
select table_name from dba_tables where owner = '用户名 '；
select table_name from user_tables;来查看所有属于当前用户的表
select table_name from all_tables;来查看所有当前用户可以访问的表
SQL> select count(*) from user_tables;
COUNT(*)
----------
868
SQL> select count(*) from all_tables;
COUNT(*)
----------
2469
SQL> select count(*) from dba_tables;
COUNT(*)
----------
2469
SQL> select count(*) from dba_views;
COUNT(*)
----------
4747
SQL> select count(*) from all_views;
COUNT(*)
----------
4747
SQL> select count(*) from user_views;
COUNT(*)
----------
3445
SQL> select count(*) from dba_roles;
COUNT(*)
----------
52
SQL> select count(*) from all_users;
COUNT(*)
----------
33
SQL> select count(*) from dba_users;
COUNT(*)
----------
33
SQL> select count(*) from user_users;
COUNT(*)
----------
1
SQL> select count(*) from all_tab_privs;
COUNT(*)
----------
30295
SQL> select count(*) from dba_tab_privs;
COUNT(*)
----------
31438
SQL> select count(*) from user_tab_privs;
COUNT(*)
----------
26214
SQL> select count(*) from user_role_privs;
COUNT(*)
----------
50
SQL> select count(*) from user_role_privs;
COUNT(*)
----------
50