题目内容
（请给出正确答案）
[主观题]
如果想限制sc（sno,cno,grade)表中每人最多选三门课，如何用断言表示？sc（sno,cno,grade)表示选修（学号，课程号，成绩）
A、Create assertion asse1 check(3＞=all(select count(*) from sc group by sno))
B、Create assertion asse1 check(3＞=any(select count(*) from sc group by sno))
C、Create assertion asse1 check(3＞=some(select count(*) from sc group by sno))
D、Create assertion asse1 check(3＞= select count(*) from sc group by sno)
提问人：网友aqjazz
发布时间：2022-01-07
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