SELECT student_id,course_id,number FROM score
where number<60 AND student_id
in (SELECT student_id from score WHERE number<60 GROUP BY student_id
HAVING count(number)>=2)
成绩表score
查询结果
SELECT student_id,course_id,number FROM score
where number<60 AND student_id
in (SELECT student_id from score WHERE number<60 GROUP BY student_id
HAVING count(number)>=2)
成绩表score
查询结果