About default value in create table

I am a new user of Oracle. I got a problem about create table. I create a table

create table TEST (

    COL1 nchar(10) default '' not null,
    COL2 nchar(10) default '' not null
); /* this line is OK */

insert into TEST( COL1 ) values ( 'A' )
/* this line fail, becuase cannot assign NULL to COL2 */

What is wrong.... ??? Received on Wed Jul 07 2004 - 10:29:59 CDT