oracle 操作工具，刪除用戶下所有的表

declare
  cursor tname is select * from all_tables t where t.OWNER='C##BENZ' ;
  t_name varchar2(32);
begin
  t_name:='select * from ';
  for ta in tname loop
        execute immediate t_name||ta.table_name;
        dbms_output.put_line(ta.table_name);
  end loop;
end;
/