SQL Schemas:

Beers(name, manf)

Bars(name, addr, license)

Drinkers(name, addr, phone)

Likes(drinker, beer)

Sells(bar, beer, price)

Frequents(drinker, bar)

In MYSQL query, please express the following:

1. Bars which serve no beer which David likes (NOT EXISTS with subquery which lists beers which likes, beer is the correlated variable in this query)

2. Beers which are liked by at most one drinker who frequents Cabana