What is the name of the high schooler who has the greatest number of friends?
create table highschooler (name varchar, id varchar, PRIMARY KEY (name)); create table friend (student_id varchar, PRIMARY KEY (student_id))
select t2.name from friend as t1 join highschooler as t2 on t1.student_id = t2.id group by t1.student_id order by count(*) desc limit 1