In MYSQL query, express the following:

1. Bars which are frequented by Jason or Susan but not by both of them

2. Pairs of drinkers and bars such that a drinker frequents the bar and the bar serves at least one beer which the drinker likes

Beers(name, manf) Bars(name, addr, license) Drinkers(name, addr, phone) Likes(drinker, beer) Sells(bar, beer, price) Frequents(drinker, bar)