Zerofill use benefit in MySQL

With Zerofill when you select a column, it pads the displayed value with zeros up to the field size specified in the column definition. It does not affect the values longer than the display width.  Note that usage of ZEROFILL also implies UNSIGNED.

ZEROFILL affects only how it is displayed. Its use and the display have no effect on how the data is stored. 

The bellow example demonstrates the use of ZEROFILL:

CREATE TABLE product(code INT(8) ZEROFILL NOT NULL, price INT(8) NOT NULL);

INSERT INTO product(code,price) VALUES 

(10, 10), 

(12, 12), 

(123, 123), 

(123456789, 500)

SELECT * FROM `product`

Result :

    

code	price
00000010	10
00000012	12
00000123	123
123456789	500