SELECT name FROM Highschooler EXCEPT SELECT T2.name FROM Friend AS T1 JOIN Highschooler AS T2 ON T1.student_id  =  T2.id
Show names of all high school students who do not have any friends.
SELECT name FROM Highschooler EXCEPT SELECT T2.name FROM Friend AS T1 JOIN Highschooler AS T2 ON T1.student_id = T2.id
select name from highschooler except select t2 . name from friend as t1 join highschooler as t2 on t1 . student_id = t2 . id
Show names of all high school students who do not have any friends .