How do you restrict "position" field to int greater than zero?

-- LAYOUT POSITIONING PER INDEX INTEGER VALUE
CREATE TABLE /*! IF NOT EXISTS */
customer_layout_positioning (
customer_id int not null,
layout_id int not null,
additional_layout_id int,
field_name varchar(125) not null,
position int not null,
primary key (customer_id, layout_id, position)
) /*! TYPE=MyISAM */;


This is a table that will determine HTML positioning of a
reference
field column value elsewhere. However, I want the
"position" field to
be of integer value that is nonzero (even greater than
zero). How do I
do that?

Thanx
Phil


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