This command removes the privilege to perform an action on a database. 
            
            
               Syntax
               
               REVOKE { privilege., ..} FROM  { grantee }
privilege ::= 
     { CONNECT 
     | DBA
     | RESOURCE }
               
                  
                     
                     
                     
                     
                        
                        
                           
                           | Keyword  | 
                           
                           Description  | 
                           
                        
                        
                     
                     
                     
                        
                        
                           
                           | 
                              privilege
                              
                            | 
                           
                           Type of access, action, or privilege to remove  | 
                           
                        
                        
                        
                           
                           | 
                              grantee
                              
                            | 
                           
                           User name(s) to allow privilege  | 
                           
                        
                        
                     
                     
                  
                
               
             
            
            
               Use
This statement removes privileges from authorization IDs that have previously received them with the GRANT statement. Only
               a database administrator (DBA) can execute this statement. 
               
                  
                  - Removing CONNECT privileges means that the grantee can no longer access the database. It has no effect on the objects owned
                     by that grantee. 
                  
 
                  
                  -  Removing RESOURCE privileges means that the grantee can no longer create new objects. 
 
                  
               
               Note: Be very careful when removing DBA privileges: If there are no other DBAs, the GRANT and REVOKE statements can no longer be
                  used. 
               
             
            
            
               Example
               
               REVOKE CONNECT FROM CLERK