考勤信息记录了学生的缺课情况，它包括：缺课日期、第几节课、课程名称、学生姓名、缺课类型（迟到、早退、请假及旷课）。试设计一考勤管理系统，使之能提供以下功能：

1．录入学生的缺课记录；

2．修改某个学生的缺课记录；

3．查询某个学生的缺课情况；

-Attendance information recorded student absences, which includes: date of non-attendance, the first few lessons, course name, student name, absent the type of (late, leave early, leave and absenteeism). Try to design an attendance management system, so that it can provide the following functionality: 1. Entry of students absent from school records　Modify a student' s non-attendance records　Check a student' s absences are