A、SELECT学号,姓名FROM student s WHERE NOT EXISTS (SELECT*FROM score sc WHERE sc.学号=s.学号AND成绩<85)
B、SELECT学号,姓名FROM Student s WHERE NOT EXISTS (SELECT*FROM score sc WHERE sc.学号=s.学号AND成绩>=85)
C、SELECT学号,姓名FROM student s,score sc WHERE s.学号=sc.学号AND成绩>=85
D、SELECT学号,姓名FROM student s,score sc WHERE s.学号=sc.学号AND ALL成绩>=85
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