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【简答题】
写出设置参照完整性规则时以下选项的功能。 (1)更新规则为“级联”时,若修改主表中关键字段的值,() (2)更新规则为“限制”时,若子表中有相关记录, () (3)删除规则为“级联”时,若删除主表的记录,() (4)删除规则为“限制”时,若子表中有相关记录,() (5)插入规则为“限制”时,若主表不存在匹配的关键字值,()
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举一反三
【单选题】We like the oil painting better, ______ we looked at it.
A.
as
B.
while
C.
the moment
D.
the more
【单选题】According to Tian Yuan’s mother, what is important for being a good friend?
A.
Good friends should be aware of their own shortcomings.
B.
Good friends should care for each other.
C.
Good friends don’t need to say sorry to each other.
【简答题】I am a good mother to three children. I have tried never to let my profession stand in the way of being a good parent. I no longer consider myself the center of the universe. I show up. I listen. I tr...
【简答题】Being a mother is apparently not like it was in the good old days. Today’s parents yearn for the golden age that their own mothers enjoyed in the 1970s and 1980s, researchers found. Mothers have less ...
【简答题】I am a good mother to three children. I have tried never to let my profession stand in the way of being a good parent. I no longer consider myself the center of the universe. I listen. I try to laugh....
【简答题】B I am a good mother to three children. I have tried never to let my profession stand in the way of being a good parent. I no longer consider myself the center of the universe. I show up.I listen. I t...
【简答题】Animals are more like us than we ever imagined．They feel pain, they experience stress, they show affection, excitement and love．All these findings have been made by scientists in recent years---and su...
【单选题】According to Tian Yuan’s mother, what is important for being a good friend?
A.
Good friends should care for each other.
B.
Good friends should be aware of their own shortcomings.
C.
Good friends don’t need to say sorry to each other.
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