问题 问答题

在考生文件夹下完成如下操作: 1.打开数据库SCORE_MANAGER,该数据库中含3个有联系的表STUDENT、SCORE1和COURSE,根据已经建立好的索引,建立表之间联系。 2.为COURSE表增加字段:开课学期(N,2,0)。 3.为SCORE1表“成绩”字段设置字段有效性规则:成绩>=0,出错提示信息是:“成绩必须大于或等于零。” 4.将SCORE1表“成绩”字段的默认值设置为空值(NULL)。

答案

参考答案:

解析:1.打开数据库设计器,在父表中选中主索引,按住鼠标拖动至子表相应的普通索引上,释放鼠标,联系即已建立。 2.打开COURSE表表设计器,将光标移动到最后的空字段格中,输入新的字段名、字段类型及长度。 3.打开表设计器,选中“成绩”字段,在“字段有效性”中的“规则”文本框中填入:成绩>=0,在“信息”文本框中填入:“成绩必须大于或等于零”,单击“确定”按钮。 4.在表设计器对话框中,选择“成绩”字段,单击NULL列下的按钮(表示此列允许空值),然后再在“字段有效性”中的默认值中填入.NULL.,单击“确定”。

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Do you think that French fries are really French? French fries are called "pommes frites" in France and they are not from France. French fries come from Belgium(比利时) originally. French fries are made of potatoes, and they are cut and fried. The fried potatoes are called French fries because they were fist seen by Americans in Belgium, but they were fried in the French way. The French way is to fry potatoes twice with a small pause in the middle.

During World War I, there were a lot of hungry American soldiers in Northern France and Belgium. They ate French fries in Belgium. After the war was over, the soldiers went back home to America. However, they missed French fries so much that they made French fries at home. That's how French fries were fist introduced to America.

French fries were called Belgian fries once, but the name was finally changed to French fries. Sometimes French fries are just called fries.

French fries are one of the most popular potato foods in America. American fast food restaurants such as McDonald's and Burger King have French fries on their menus. French fries are freshly fried, and usually served with hamburgers.

If you visit any fast food restaurant in America and order a hamburger, you will probably hear "You want fries with that?"Why don't you think about the history of French fries a little while, and say "Yes, please. Thank you."

小题1:What are French fries made of?

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小题2:Where do French fries originally come from?

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小题3:Why are the fried potatoes called French fries?

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小题4:Who first introduced French fries to America?

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小题5:What does the underlined "that" in the last paragraph refer to?

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