/*
 列出指定表的所有字段, 使用时将 SYS_TABLE 换成具体表名即可[Oracle 10g下运行通过]
*/
declare
  cursor c is 
  select a.COLUMN_NAME||' ' from user_tab_columns a
  where a.TABLE_NAME = 'SYS_TABLE';
  
  col user_tab_columns.COLUMN_NAME%type;
  cols varchar2(4000);
begin
  open c;
  loop
    fetch c into col;
    exit when c%notfound;
    cols := cols || col;
  end loop;
  close c;
  
  dbms_output.put_line(cols);
end;