网友您好， 请在下方输入框内输入要搜索的题目：
题目内容
（请给出正确答案）
Given the following two tables:TAB1 R1A A A B B C C D E TAB2 R2A A B B C C DWhich of the following queries returns the following result set? RETVAL E()
A.SELECT r1 AS retval FROM tab1 INTERSECT SELECT r2 AS retval FROM tab2
B.SELECT r1 AS retval FROM tab1 EXCEPT SELECT r2 AS retval FROM tab2
C.SELECT DISTINCT r1 AS retval FROM tab1, tab2 WHERE r1 <> r2
D.SELECT r1 AS retval FROM tab1 UNION SELECT r2 AS retval FROM tab2
参考答案
更多 “ Given the following two tables:TAB1 R1A A A B B C C D E TAB2 R2A A B B C C DWhich of the following queries returns the following result set? RETVAL E() A.SELECT r1 AS retval FROM tab1 INTERSECT SELECT r2 AS retval FROM tab2B.SELECT r1 AS retval FROM tab1 EXCEPT SELECT r2 AS retval FROM tab2C.SELECT DISTINCT r1 AS retval FROM tab1, tab2 WHERE r1 r2D.SELECT r1 AS retval FROM tab1 UNION SELECT r2 AS retval FROM tab2 ” 相关考题
考题
196. Shoppers who carefully plan their visit to the grocery store can save money on their grocery bills. Shopping when not hungry, sticking to their grocery list, and _1_ a few simple rules will cut down the grocery bill. Shoppers should visit the grocery store on a full stomach by planning their trip _2_ after a large meal. If that’s not possible, they should find something healthy to eat on while preparing a grocery list. Most shoppers are less _3_ to buy extras when they are not troubled by hunger. Although having a list and _4_ to it is the most important factor in saving money, shoppers must prepare lists wisely in order to save. A carefully planned list should _5_ in season produce and any items on sale or discount through coupons. Many special buys are announced through the local newspapers, so buying the “grocery issue” is _6_ the money you spend. What’s more, it’s important to remember that many newer, more expensive products first offered through coupons may not _7_ enough savings for shoppers to give up products they usually buy. Now that the shopper has _8_ the grocery list, it’s time to leave for the store. However, no preparations are complete without a pocket calculator or a piece of paper and a pencil to figure costs. Once at the store, the shopper who wants to save money should follow a few more rules. The shoppers should not stay _9_ than necessary because bills go up each minute the shopper is in the store. So, _10_ a time limit and a cost limit can hold down the bill. [共10题](1)(A) carrying (B) making (C) taking (D) following(2)(A) recently (B) regularly (C) immediately (D) completely(3)(A) willingly (B) likely (C) reluctantly (D) happily(4)(A) sticking (B) replying (C) according (D) belonging(5)(A) keep (B) make (C) increase (D) include(6)(A) worth (B) suitable (C) value (D) fit(7)(A) come from (B) result in (C) succeed in (D) depend on(8)(A) saw (B) taken (C) completed (D) read(9)(A) shorter (B) faster (C) longer (D) quicker(10)(A) setting (B) putting (C) making (D) taking
考题
You’re going to have a quiz ( )by another two in the ( )month.
A. followed,followedB. followed,followingC. following,followedD. following,following
考题
publicclassDrinkimplementsComparable{publicStringname；publicintcompareTo（Objecto）{return0；}}and：Drinkone=newDrink（）；Drinktwo=newDrink（）；one.name=Coffee”；two.name=Tea”；TreeSetset=newTreeSet（）；set.add（one）；set.add（two）；AprogrammeriteratesovertheTreeSetandprintsthenameofeachDrinkobject.Whatistheresult？（）A.TeaB.CoffeeC.CoffeeTeaD.Compilationfails.E.Thecoderunswithnooutput.F.Anexceptionisthrownatruntime.
考题
Given：11.Stringtest=TestA.TestB.TestC.；12.//insertcodehere13.String[]result=test.split（regex）；Whichregularexpression，insertedatline12，correctlysplitstestintoTestA，TestB，andTestC？（）A.Stringregex=；B.Stringregex=；C.Stringregex=.*；D.Stringregex=\\s；E.Stringregex=\\.\\s*；
考题
根据下面资料，回答
I grew up in a community called Estepona. I was 16 when one morning my Dad told me I could drive him into a 16 village called Mijas, on condition that I took the car in to be 17 at a nearby garage. I readily accepted. I drove Dad into Mijas, and 18 to pick him up at 4 p.m. then dropped off the car at the 19 . With several hours to spare, I went to a theater 20 , when the last movie finished, it was six. I was two hours late!
I knew Dad would be angry if he 21 I′d been watching movies. So I decided not to tell him the truth. When I 22 there I apologized for being late, and told him I′ d 23 as quickly as I could, but that the car had needed a major repairs. I′ll never forget the 24 he gave me. "I′m disappointed you 25 you have to lie to me, Jason." Dad looked at me again. "When you didn′t 26 , I called the garage to ask if there were any 27 , and they told me you hadn′t yet picked up the car." I felt 28 as I weakly told him the real reason. A 29 passed through Dad as he listened attentively. "I′m angry with 30 . I realize I′ve failed as a father. I′m going to walk home now and think seriously about 31 I′ve gone wrong all these years." "But Dad, it′s 18 miles!" My protests and apologies were 32 . Dad walked home that day. I drove behind him, 33 him all the way, but he walked silently.
Seeing Dad in so much 34 and emotional pain was my most painful experience. However, it was 35 the most successful lesson. I have never lied since.
第（33）题选A.asking
B.persuading
C.begging
D.following
考题
Higher cognitive abilities may come with a pitfall-a susceptibility to judging people based on stereotypes.A new study from New York University l that highly intelligent people are quicker to learn stereotypes and base decisions off them.It may come down 2 someone's ability to detect and encode patterns.It's not all bad news 3,as these high-intelligence people are likely to quickly update and 4 their ideas on stereotypes when introduced to new information.For the study,1,257 individuals were shown a（n）5 0f computerized male faces that were paired with a description of past behavior,either positive or negative However,the researchers manipulated avatar faces 6 people with noses that were purposely wider were associated with negative traits,7.those with more narrow noses were associated with positive traits.8this,individuals were asked to complete a task in 9 they had to trust an individual online who was represented by an avatar face 10 those the volunteers were shown in the trait association task.Individuals who 11 higher on pattern detection,12 0f higher intelligence,were also more likely to associate wider noses with negative traits,and were 13 likely to trust wide-nosed avatars in the final task.Pattern detection is an essential part of human intelligence,and is one of the main features that helped our brains evolve 14 what they are today,but the skill has its limits."Finding that higher pattern detection ability 15 people at greater risk to detect and apply stereotypes,but also to reverse them,implicates this ability as a cognitive mechanism 16 stereotyping,"added co-author Jonathan Freeman in a statement.While stereotypes can be useful and a way to avoid danger,17 associating police officers with safety or gunmen with danger,there are pitfalls t0 18 people based on a generally held idea.Stereotypes cause you to judge people 19.knowing anything about them-we wouldn't want others to do that to us,20 why not afford them the same Courtesy 8选？A.Finishing
B.Accompanying
C.Preceding
D.Following
考题
共用题干
Vibrating Rubber CeliphonesVibrating rubber celiphones could be the next big thing in mobile communications.They allow people to press the phone to transmit vibrations along with their______(51)words.According to a research team at the MIT Media Lab in Cambridge,Massachusetts,the idea will make______ (52)more fun.Many mobile phones can already vibrate instead of ringing______(53)you do not want people to know you are getting a call. "But these______ (54) are too simple for subtle（敏感的） communication".______(55)Angela Chang of the lab's Tangible Media Group."They're either on or off,"she says.But when you hold Chang's rubber cellphone your fingers and thumb wrap around five ______(56)speakers. They vibrate______(57)your skin around 250 times per second.Beneath these speakers sit pressure sensors（传感器）,so you can transmit vibration as well as ______(58)it. When you squeeze with a finger,a vibration signal is transmitted______(59) your caller's corresponding finger,its speed______(60)on how hard you squeeze.Chang says that within a few minutes of being given the phones,students were using the vibration feature to______(61)emphasis to what they were saying. Over time,people even began to transmit their own kind of ad hoc（特别的）" Morse code " , which they would repeat back to show they were______(62)what the other person was saying.Chang thinks"vibralanguages"could function for the same______(63)as texting:sometimes people want to communicate______(64)without everyone nearby knowing what they're saying."And______(65)actually being able to shake someone's hand when you close a business deal,"she says._________(62)A:controlling B:askingC:discussing D:following
考题
4、下面的程序是否能够正常执行，若不能，请解释原因；若能，请分析其执行结果。 from random import randint result = set（) while True: result.add（randint（1,10)) if len（result)==20: break print（result)
热门标签
最新试卷