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【简答题】
关于教学数据库的关系模式如下: Student(Sno,Sname,Sage,Ssex) Course(Cno,Cname,Teacher) SC(Sno,Cno,Grade) 其中,Student表示学生,它的各属性依次为、姓名、年龄和性别;Course表示课程,它的各属性依次为课程号、课程名称和任课教师;SC表示成绩,它的各属性依次为、课程号和成绩。 (1) 试用SQL语句定义关系模式SC和Course,并将各属性定义为你认为最合适的数据类型,分别将和课程号定义为主码。 (2)向 Student 表中加入一条记录,记录内容自定; (3) 修改将 Student 表中姓名为,改为; (4) 将姓名为的同学的记录删除。
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