database code for trigger and basic sql codes for insert delete and update

数据库实验报告，包括数据库的创建与使用，视图与索引的创建和使用，数据库的简单查询和连接查询-Database lab report, including the creation and use of databases, view and index creation and use simple database queries and join queries

广州大学实验报告提交系统 学生能够查看自己的成绩，提交实验报告，老师可以给出实验报告的分数，管理员可以创建用户，绑定课程-Guangzhou University lab report submission system that students can see their results, submit test reports, the teacher can give the test score reports, administrators can create users, b