List the drinkers who like every beer served at 'The Swan'. The answer should have one attribute drinker. Note that, if 'The Swan' does not serve any beer, then all drinkers should be in the answer. 2. Find the bars that serve every beer Joe likes at the lowest price. The answer should have a single attribute bar. frequents drinker bar serves bar beer price likes drinker beer Q1. Write query 1 and query 2 in relational calculus using universal quantification. Q2. Write query 1 and query 2 in relational calculus using only essential quantification. Q3. Write query 1 and query 2 in SQL query that uses only NOT EXISTS on nested queries.