试题二（共15 分）阅读下列说明，回答问题1至问题3，将解答填入答题纸的对应栏内。【说明】某网上书店后台数据库的部分关系模式如下：会员（会员编号，用户名，密码，姓名，地址，邮编，电话，消费额，积分）图书（图书编号，类型名称，图书名称，作者，出版社，出版日期，ISBN，价格）订单（订单编号，用户名，销售额，订购日期，出货日期）订单明细（订单明细编号，订单编号，图书编号，数量）
【问题3】（2分）会员订购图书后，将本次订购的销售额累加到该会员的消费额中，并按照本次订单的销售额计算积分累加到该会员的积分中（每20元增加1个积分，不足20元不计入积分）。下面用触发器实现该需求，请填充空缺部分。CREATE TRIGGER 会员积分_TRIGGERAFTER （n）REFERENCING NEW ROW AS NROWBEGINUPDATE 会员SET 消费额 = 消费额 + NROW.销售额, （o）WHERE 用户名 = NROW.用户名END
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解析：
从方框中选择恰当的句子完成下面的对话。（共5分，每小题1分） A: Hi, Lin Fang. You look unhappy, what’s wrong? B: 小题1: A: I don’t think that’s a good idea. We aren’t children any longer. B: That’s right. 小题2: A: Really? My father allows me to make friends with all of my classmates, but my mother doesn’t agree with him. B: 小题3: My mother doesn’t let me play computer games when I am free, either. A: I think she is right. We mustn’t spend too much time playing computer games. 小题4: He thinks a girl should have long hair. B: That’s funny. My father always tells me not to ride my bike to school. He thinks it’s too dangerous. A: I don’t think it is, but you should ride slowly. It’s too dangerous to ride fast. B: You are right. 小题5: A: I think we need to talk to them and make them understand us. B: You are right.
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