问题
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学生选修课程的关系模式为SC(S,Sn,Sd,Sa,C,G)(其属性分别为学号、姓名、所在系、年龄、课程号和成绩)
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定义学生选修课程的关系模式如下:SC(S,Sn,C,Cn,G)(其属性分别为学号、姓名、课程号、课程名、成绩)则
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定义学生选修课程的关系模式如下:SC(S,Sn,C,Cn,G)(其属性分别为学号、姓名、课程号、课程名成绩)。该
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设有选课表,表中包含的字段有:学号C(3),课程号C(3),成绩N(3)。查询每门课程的学生人数,
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有如下两个关系模式:student(学号,姓名,奖学金)score(学号,课程号,成绩),则()是score相对与stu
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定义学生选修课程的关系模式如下:SC(S Sn C Cn G)(其属性分别为学号 姓名 课程号 课程名成绩)。该
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