数据库大作业
............\ave_class_grade.php
............\ave_grade.php
............\course_average.php
............\course_grade_spread.php
............\delete_course.html
............\delete_course.php
............\delete_select_course.php
............\delete_stu.html
............\delete_stu.php
............\grade.html
............\insert.html
............\insert_course.php
............\insert_select_course.php
............\insert_stu.php
............\main.html
............\select11.php
............\select12.php
............\select21.php
............\select22.php
............\select41.php
............\select42.php
............\select5.html
............\select51.php
............\select52.php
............\select_course.html
............\select_grade.html
............\select_select_course.html
............\select_sid_cid.php
............\select_sid_cname.php
............\select_sname_cid.php
............\select_sname_cname.php
............\select_stu_info.html
............\update.html
............\update_course.php
............\update_select_course.php
............\update_stu.php