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为Student数据库中Classes基本表的Class_name列上创建惟一的非聚集索引。该索引将强制插入Class_name数据列
中的数据具有惟一性，保证了班级名称不重名。
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更多“为Student数据库中Classes基本表的Class_n…”相关的问题
在数据库Student中，创建名为Classes的基本表。要求在班级名称(Class_name)属性列上设置UNIQUE约束。通过此方法间接实现索引名为UQ_Classes_7F60ED59的惟一、非聚集性索引，创建结果如图所示。
A.present
B.attend
C.go
D.follow
A．It offers night classes enabling the student to continue at his present job.
B．It gives scholarships to students working in large firms.
C．It promises wonderful employment in new fields.
D．It provides the students with good jobs like lawyers in the future.
A．Receiving advice from people who guide their studies.
B．Discussing with other students and the tutors.
C．Attending summer classes given by professors.
D．Listening to the radios and watching TV.
在数据库Student中，修改名为Courses的基本表。要求为该系统增加在上课地点(Courses_address)属性列，并在其上添加UNIQUE约束Course_address_u-nique。通过此方法间接实现索引名为Courses_address_unique的惟一性、非聚集索引，创建的结果如图所示。
According to the first paragraph, an American student is allowed ______.
A．to live in a different university
B．to take a particular course in a different university
C．to live at home and drive to classes
D．to get two degrees from two different universities
