20xx年電大數(shù)據(jù)庫應(yīng)用技術(shù)期末試題考試小抄-資料下載頁
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【導(dǎo)讀】1．三級模式間存在兩種映射，它們是。2．SQLServer系統(tǒng)中的所有系統(tǒng)級信息存儲于哪個數(shù)據(jù)庫。3．下面關(guān)于tempdb數(shù)據(jù)庫描述不正確的是。D．是用戶建立新。4．在數(shù)據(jù)庫技術(shù)中，面向?qū)ο髷?shù)據(jù)模型是一種。5．?dāng)?shù)據(jù)庫管理系統(tǒng)常見的數(shù)據(jù)模型有。B．層次、關(guān)系和網(wǎng)狀。8．保持?jǐn)?shù)據(jù)的完整性屬于數(shù)據(jù)庫管理系統(tǒng)的功能。9．在SQLServer數(shù)據(jù)庫中，默認(rèn)情況下Sys通常是。3．關(guān)系數(shù)據(jù)庫規(guī)范化是為了解決關(guān)系數(shù)據(jù)庫中的問題。的同學(xué)，那么條件語句應(yīng)。B．Where姓名LIKE‘張％’。，學(xué)生選課關(guān)系SC。學(xué)生姓名，將涉及到關(guān)系。1．如果希望從學(xué)生表中查詢出所有姓?2．在一個教師關(guān)系中，能夠成為主關(guān)鍵字的屬性是。6．下列關(guān)于索引的說明不正確的是。函數(shù)依賴，則R符合。11．用戶使用SQLServer時，通常需要依次經(jīng)過兩個安全性階段。C、身份驗證、權(quán)限認(rèn)證。B、SELECTMAX(年齡)AS最大FROM學(xué)生表。10．SQLServer默認(rèn)的登錄賬號為（）。12．下列SQL語句中，能夠完成刪除功能的是（）。
【正文】 how he felt and I would like to speak to him first to find out what his experience was. Uefa has opened disciplinary proceedings against CSKA for the racist behaviour of their fans during City39。s 21 win. Michel Platini, president of European football39。s governing body, has also ordered an immediate investigation into the referee39。s actions. CSKA said they were surprised and disappointed by Toure39。s plaint. In a statement the Russian side added: We found no racist insults from fans of CSKA. Baumgartner the disappointing news: Mission aborted. The supersonic descent could happen as early as Sunda. The weather plays an important role in this mission. Starting at the ground, conditions have to be very calm winds less than 2 mph, with no precipitation or humidity and limited cloud cover. The balloon, with capsule attached, will move through the lower level of the atmosphere (the troposphere) where our daytoday weather lives. It will climb higher than the tip of Mount Everest ( miles/ kilometers), drifting even higher than the cruising altitude of mercial airliners ( miles/ kilometers) and into the stratosphere. As he crosses the boundary layer (called the tropopause),e can expect a lot of turbulence. The balloon will slowly drift to the edge of space at 120,000 feet ( Then, I would assume, he will slowly step out onto something resembling an Olympic diving platform. Below, the Earth bees the concrete bottom of a swimming pool that he wants to land on, but not too hard. Still, he39。ll be traveling fast, so despite the distance, it will not be like diving into the deep end of a pool. It will be like he is diving into the shallow end. Skydiver preps for the big jump When he jumps, he is expected to reach the speed of sound 690 mph (1,110 kph) in less than 40 seconds. Like hitting the top of the water, he will begin to slow as he approaches the more dense air closer to Earth. But this will not be enough to stop him pletely. If he goes too fast or spins out of control, he has a stabilization parachute that can be deployed to slow him down. His team hopes it39。s not needed. Instead, he plans to deploy his 270squarefoot (25
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