INSERT QUERY

[Krishna Chandra Prajapati]

hi all,

create table stu (name varchar(20), roll int(2), id decimal(2));

insert into stu values ('krishna', '25', '25');
insert into stu values ('krishna', 25, 25);

The above two queries are working properly.
my question is whether it is going to impact in future.
Integer and decimal values in quotes (') and without quotes makes any
difference.
Normally which format should be used.

Regards,
Krishna