jQuery，ajax，php，msyql：自动建议表单输入

I have a mysql db table that has every U.S. city, state, zip, lat, long. On my site page I have a form input for cities. As the user types, I'd like to suggest city, state. What current practices/techniques are good? (Limitations are jQuery, PHP, MYSQL)I have a mysql db table that has every U.S. cit