query: SELECT student_id FROM student_course_registrations GROUP BY student_id ORDER BY count(*) LIMIT 1
question: what i oned student who register some course which that least number course these student?
query_toks: SELECT student_id FROM student_course_registrations GROUP BY student_id ORDER BY count ( * ) LIMIT 1
query_toks_no_value: select student_id from student_course_registrations group by student_id order by count ( * ) limit value
question_toks: what i oned student who register some course which that least number course these student?