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修改Student中的Courses上的索引IX_Courses_Course_name，使其禁用。

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发布时间：2022-12-04

更多“修改Student中的Courses上的索引IX_Courses_Course_name，使其禁用。”相关的问题

第1题

If you want to select courses you'd better______.A．call up the Office of Student ServicesB

If you want to select courses you'd better______.

A．call up the Office of Student Services

B．get in touch with the Admissions Office

C．read your acceptance letter

D．visit Student Services' website

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第2题

According to the passage, a "pacing" device ______ .A．is used to time a student's reading

According to the passage, a "pacing" device ______ .

A．is used to time a student's reading speed

B．is not used in most, speed reading courses

C．is used as an aid to vocabulary learning

D．should be used whenever we read alone

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第3题

Student：1 was wondering if I could take four courses next semester． Advisor：__________？We

already have such a heavy course load．

A.Come on．Four is better than three

B.Why don’t you choose three instead of four

C.Dare you try to take four

D.Don’t you believe four courses are OK

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第4题

在Visual FoxPro中，使用SQL命令将学生表STUDENT中的学生年龄AGE字段的值增加1岁，应该使用的命令是：______。

A) REPLACE AGE WITH AGE+1

B) UPDATE STUDENT AGE WITH AGE+1

C) UPDATE SET AGE WITH AGE+1

D) UPDATE STUDENT SET AGE=AGE+1

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第5题

Economics is the study of how societies with limited resources decide what to produce, how

to produce and for whom to produce. What, how, and for whom to produce are problems all over the world because human wants are practically unlimited, but all societies have only limited quantities of resources that can be used to produce goods or services. A knowledge of basic economics is important for understanding both the problems and opportunities that will face the world economy in the 21st century. As a student of economics, one will have the chance to discover how commerce, government policies, and day-to-day decisions made by consumers affect his living standards. The study of economics can help him understand the influence of such events as the move to free markets in Poland and Russia, or of ups and downs in interest rate and the foreign exchange rate. Economics is influenced by developments in the many different areas of business, politics, science, nature, religion and history. And whether or not one is aware of it, economics is an important part of his life. From a practical point of view, one s study of economics will help improve his decision-making skills. He learns a logical way to compare different courses of action. As he studies the concept of opportunity cost, for instance, he will discover that every choice he makes has both a benefit and a cost. Suppose someone decides to get a part time job so he can earn enough money to buy a car. He will have the benefit of owning the car, but he will pay a cost in terms of the leisure hours he gives up for working so as to pay for the car and keep it in good condition. After weighing his choice in cost-benefit terms, he may decide he does not need a car any more.

According to the passage, economics is studied to______.

A．get more resources for human beings

B．put human wants under some control

C．satisfy the unlimited human wants with the limited resources

D．produce better goods and services for all human beings

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第6题

在SQL Server 2000的查询分析器中执行命令：SELECT*FROM STUDENT WHERE XB IS NULL执行结果是（)。

A.STUDENT表中XB(性别)为空的一条记录

B.STUDENT表中XB(性别)为空的所有记录

C.STUDENT表中XB(性别)为空的带*的记录

D.以上均错