How to add a positive integer constraint to a integer column in MySQL?

Question

How can we add a constraint which enforces a column to have only positive values.

Tried the following mysql statement but it doesn\'t work

create tab         


        

Answer 1

The way to fix this is to explicitly tell MySQL Server to create an Unsigned integer.

CREATE TABLE tbl_example ( 
example_id INT UNSIGNED NOT NULL AUTO_INCREMENT, 
example_num INT UNSIGNED NOT NULL, 
example_text TEXT 
PRIMARY KEY (`example_id`) 
);