問題描述

Create table Student( Sno varchar(7) primary key, Sname varchar(10) not null, Ssex char (2) check(Ssex=‘男’or Ssex=’女’), Sage int check(Sage between 15 and 45), Sdept varchar(20) default ‘計算機系’);

Create table course( Cno varchar(10) primary key, Cname varchar(20) not null, Ccredit int check(Sctedit>0), Semester int check(Semester>0), Period int check(Period>0));

Create table SC( Sno varchar(7) foreign key references student(Sno), Cno varchar(10) foreign key references course(Cno), Grade int check(Grade between 0 and 100), Primary key (Sno,Cno));

前兩個可以成功的建表，但是第三個建表報錯：

更改第三個：

Create table SC( Sno varchar(7), Cno varchar(10), Grade int check(Grade between 0 and 100), foreign key (Sno) references student(Sno), foreign key (Cno) references course(Cno), Primary key (Sno,Cno),);

還是報錯：

求解答，謝謝大佬！

問題解答

創(chuàng)建外鍵的寫法錯誤吧,