query: SELECT min(grade) FROM Highschooler WHERE id NOT IN (SELECT T1.student_id FROM Friend AS T1 JOIN Highschooler AS T2 ON T1.student_id  =  T2.id)
question: Find the minimum grade of students have no friends.
query_toks: SELECT min ( grade ) FROM Highschooler WHERE id NOT IN ( SELECT T1.student_id FROM Friend AS T1 JOIN Highschooler AS T2 ON T1.student_id = T2.id )
query_toks_no_value: select min ( grade ) from highschooler where id not in ( select t1 . student_id from friend as t1 join highschooler as t2 on t1 . student_id = t2 . id )
question_toks: Find the minimum grade of students have no friends.