小编use*_*396的帖子

我遇到了这个问题

这是我对此的回应，我最近刚刚开始学习 SQL。

Select a.roll_number
     , a.name
     , b.roll_number 
  from student_information a
  join examination_marks b
    on a.roll_number = b.roll_number
 Group 
    by roll_number
 Having Sum(subject_one.examination_marks + subject_two.examination_marks + subject_three.examination_marks) < 100;