教师管理系统是在学校局域网架设的B/S结构的办公平台。系统有四个模块：系统设置，通知通告，领导信箱，文件中心。系统开发环境：JAVA，数据库为Mysql,TOMCAT-management teachers in the school system is set up LAN B / S structure of the office platform. System has four modules : system set up to notify circular leadership B

Design and develop a suitable Student Database application. One of the attributes to me maintained is the attendance of a student in each subject for which he/she has enrolled. Using TRIGGERS, write active rules to do the following: a. Whenever the