create table memberboard (
   num int not null auto_increment,
   id char(20) not null,     
   name char(20) not null,
   subject char(200) not null,
   content text not null,
   regist_day char(20),
   file_name char(40),
   file_type char(40),
   file_copied char(40),   
   primary key(num)
);