What are the names of the hosts that held parties with more than 20 hosts?
select t2.name from party_host as t1 join host as t2 on t1.host_id = t2.host_id join party as t3 on t1.party_id = t3.party_id where t3.number_of_hosts > 20
What are the names of the hosts that held parties with the least number of hosts?
select t2.name from party_host as t1 join host as t2 on t1.host_id = t2.host_id join party as t3 on t1.party_id = t3.party_id order by t3.number_of_hosts asc limit 1
What is the location of the party with the oldest host?
select t3.location from party_host as t1 join host as t2 on t1.host_id = t2.host_id join party as t3 on t1.party_id = t3.party_id order by t2.age desc limit 1