SELECT semester ,  YEAR FROM takes GROUP BY semester ,  YEAR ORDER BY count(*) LIMIT 1
Find the semester and year which has the least number of student taking any class.
SELECT semester , YEAR FROM takes GROUP BY semester , YEAR ORDER BY count ( * ) LIMIT 1
select semester , year from takes group by semester , year order by count ( * ) limit value
Find the semester and year which has the least number of student taking any class .