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（ ）。
企业资源计划的简称是（ ）。
信息系统是人机系统，系统安全的威胁更多来源于（ ）。
（ ）是企业的命脉，很容易成为被攻击和窃取的目标。
数据加密和信息隐藏都是针对（ ）采取的安全技术。
系统维护的目标是（ ）。
题目
简单查询
本题考查查询含有空值NULL的记录。
多做几道
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- 材料全屏SingaporeSingapore is an independent city-state in southeastern Asia, consisting of one major island—the Singapore island—and more than 50 small islands, located off the southern tip of Malay. The city of Singapore, the capital of the country, is at the southeastern end of the Singapore Island; it is one of the most important port cities and commercial centers of Southeast Asia. The total area of the republic is 640 sq kmLow-lying Singapore Island has no outstanding relief(轮廓鲜明的) features. A central area of hills rises to the maximum height of 176 m. The country has a wet tropical climate, with an average annual temperature of 27.20℃. The average annual rainfall is 2.413 mm. the wettest months are November through January.Singapore is governed under a constitution of 1959. A president, elected to a four-year term, is head of state, and a prime minister is head of government. The president used to be selected by Parliament, but by 1991 constitutional amendment（修正案）, the president is now elected directly by the people. The Parliament is the law-making body with its 81 members popularly elected.In the late 1980s the country had some 290 primary schools with 278,300 pupils and 160 secondary schools with 200,200 students. The main institutions of higher education are the National University of Singapore, several technical colleges, and a teachers college.Singapore has one of the highest standards of living of any country in Asia. In the late 1980s the gross domestic product was estimated at $23.7 billion, or $8, 870 per person. The fishing industry is centered on the port of During, on southwestern Singapore Island. Industry has grown rapidly since the 1960s, and Singapore now produces a diversity of goods, including chemicals, electronic items, clothing, and processed foods, etc. Shipbuilding and petroleum refining are also important.1【单选】Paragraph 1（）AEducationBLand and ClimateCState SystemD General IntroductionEEconomyFPopulation
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- Researchers did another survey after the Gallop poll.（）ARightBWrongCNot mentioned
- 材料全屏 Moderate Earthquake Strikes England【*】A moderate earthquake struck parts of southeast England on 28 April 2007, toppling chimneys from houses and rousing residents from their beds. Several thousand people were left without power in Kent County. One woman suffered minor head and neck injuries.【*】It felt as if the whole house was being slid across like a fun-fair ride,"said the woman.The British Geological Survey said the 4.3-magnitude(震级)quake struck at 8:19 a.m. and was centered under the English Channel, about 8.5 miles south of Dover and near the entrance to the Channel Tunnel.【*】Witnesses said cracks appeared in and chimneys collapsed across the county. Residents said the tremor had lasted for about 10 to 15 seconds.【*】I was lying in bed and it felt as if someone had just got up from bed next to me,"said Hendrick Van Eck, 27, of Canterbury about 60 miles southeast of London."I then heard the sound of cracking and it was getting heavier and heavier. It felt as if someone was at the end of my bed hopping up and down."There are thousands of moderate quakes on this scale around the world each year, but they are rare in Britain. The April 28 quake was the strongest in Britain since 2002 when a 4. 8-magnitude quake struck the central England city of Birmingham.【*】The country's strongest earthquake took place in the North Sea in 1931, measuring 6.1 on the Richter(里氏)scale. British Geological Survey scientist Roger Musson said the quake took place on 28 April in an area that had seen several of the biggest earthquakes ever to strike Britain, including one in 1580 that caused damage in London and was felt in France. Musson predicted that it was only a matter of time before another earthquake struck this part of England. However, people should not scared too much by this prediction, Musson said, as the modern earthquake warning system of Britain should be able to detect a forthcoming quake and announce it several hours before it takes place. This would allow time for people to evacuate and reduce damage to the minimum.1【单选】During the April 28 earthquake, whole England was left without power.（）ATrueBFalseC Not Given
- The 4. 3-magnitude quake struck at 8: 19 p. m. in England and was centered under the English Channel.（）ATrueBFalseCNot Given
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