• To display the names of objects created by users:

   SQL> SELECT object_name FROM user_objects; 

• ALL_TAB_COLUMNS contains information about columns of all tables and views. Table name such as inventory has to use capital letters. Oracle is a case-insensitive system, but is with few exceptions.

   SQL> SELECT column_name, data_type FROM all_tab_columns 
     2    WHERE table_name = 'INVENTORY'; 

• TABLE_PRIVILEGES and COLUMN_PRIVILEGES list privileges granted:

   SQL> SELECT grantor, delete_priv FROM table_privileges 
     2    WHERE table_name = 'USER_TABLES'; 

• USER_VIEWS contains information about views:

   SQL> SELECT view_name FROM user_views; 

• USER_TYPES provides a top-level view of each object type:

   SQL> SELECT type_name FROM user_types; 

• USER_DEPENDENCIES contains information about dependencies:

   SQL> SELECT referenced_name FROM user_dependencies 
     2    WHERE name = 'INVENTORY'; 

 SQL> SELECT title FROM inventory; 
 SQL> SELECT title FROM wenchen.inventory;