题目内容
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提问人:网友duomingo
发布时间:2022-01-07
[主观题]
例举不能通过视图修改数据的情况
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A、create view view1 as select sno, avg(grade) from sc group by sno
B、create view view2 as select sno, sname, sdept from student where sdept='CS'
C、create view view3 as select sno, sage+20 from student where ssex='女'
D、create view view4 as select student.sno, sname, sc.sno, cno, grade from sc,student where sc.sno=student.sno and cno='1'
A.修改字段类型
B.设置索引
C.增加字段
D.删除记录
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