ORA-01981
        CASCADE CONSTRAINTS must be specified to perform this REVOKE.
        
        
        Cause
        During this REVOKE, some foreign key constraints could not be removed. To perform this automatically, CASCADE CONSTRAINTS must be specified.
        Action
        Remove the constraints or specify CASCADE CONSTRAINTS.
        
     
    
    
        ORA-01981
        CASCADE CONSTRAINTS must be specified to perform this revoke
        
        
        Cause
        During this revoke some foreign key contraints will be removed. In order to perform this automatically, CASCADE CONSTRAINTS must be specified.
        Action
        Remove the constraints or specify CASCADE CONSTRAINTS.
        
     
    
    
        ORA-01981
        CASCADE CONSTRAINTS must be specified to perform this revoke
        
        
        Cause
        During this revoke some foreign key contraints will be removed. In order to perform this automatically, CASCADE CONSTRAINTS must be specified.
        Action
        Remove the constraints or specify CASCADE CONSTRAINTS.