基于C#、SQL学生选课管理系统

create table course ( courseid varchar(15), coursename varchar(50), introduction varchar(100), xueshi varchar(10), xuefen varchar(10), classroom varchar(20), classtime timestamp, teachername varchar(10), primary key(courseid,coursename,teachername), foreign key(teachername) references teacher(teachername) ) create table teacher ( teacherid varchar(15), teachername varchar(10), tsex varchar(2), tage varchar(4), jiaoling varchar(4), zhicheng varchar(50), tintroduce varchar(100), primary key(teacherid,teachername) )