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单项选择题
A.SELECT stu_name FROM student_info Where stu_grade=80 ORDER BY stu_id ASC;
B.SELECT stu_name FROM student_info WHERE stu_grade=80 ORDER BY stu_id DESC;
C.SELECT stu_id,stu_name FROM student_info WHERE stu_grade=80 ORDER BY stu_name ASC;
D.SELECT stu_name FROM student_info WHERE stu_grade LIKE 80 ORDER BY stu_id DESC;
单项选择题
A.Book-code
B.Book-name
C.Issue-dt
D.Mem-cd
单项选择题
A.在Professors表中建立一个主键,引用Courses表
B.在Courses表中建立一个外键,引用Professors表
C.在Professors表中建立一个外键,引用Courses表
D.在Courses表中建立一个主键,引用Professors表