i got row in table for link to picture, can i by default put link to some default picture when someone don't type link?

link_to_picture varchar(100) default ''

when you create a table you can set a default:

CREATE TABLE `table_name` (
`link_to_picture` VARCHAR( 100 ) DEFAULT '<img src="link" alt="" title="">' NOT NULL ,
`id` AUTO_INCREMENT,
PRIMARY KEY ( `id` )
);

thanks