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Question 7: Can you tell me what the difference of two SQL statements at performance of ex

Question 7: Can you tell me what the difference of two SQL statements at

performance of execution？

Statement 1:

if NOT EXISTS (select * from publishers where state = 'NY')

begin

SELECT 'Sales force needs to penetrate New York market'end

else

begin

SELECT 'We have publishers in New York'

end

Statement 2:

if EXISTS (select * from publishers where state = 'NY')

begin

SELECT 'We have publishers in New York'

end

else

begin

SELECT 'Sales force needs to penetrate New York market'

end

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发布时间：2020-08-10

更多“Question 7: Can you tell me what the difference of two SQL statements at performance of ex”相关的问题

第1题

Question 1：Can you use a batch SQL or store procedure to calculating the Number of Days in

Question 1：Can you use a batch SQL or store procedure to calculating

the Number of Days in a Month

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第2题

Section ADirections: This section is to test your ability to give proper answers to questi

Section A

Directions: This section is to test your ability to give proper answers to questions. There are 5 recorded questions in it. After each question, there is a pause. The questions will be spoken two times. When you hear a question, you should decide on the correct answer from the 4 choices marked A, B, C and D.

(1)

A．About 3 miles.

B．You can take the No. 2 bus.

C．In half an hour.

D．It's very near.

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第3题

Have you ever felt your mind getting confused after a sleepless night? You couldn’t co

Have you ever felt your mind getting confused after a sleepless night？ You couldn’t come up with an original thought no matter how hard you tried.

You were probably right if you thought that was caused by a lack of sleep.Dr.Home, a sleep researcher in England, studied 24 college students.One group got their normal eight hours of sleep.The other group didn’t get the smallest amount of sleep — they stayed awake all night.The next day, Dr.Home tested the students.He asked them questions that required creative and original thinking.One of the questions was “How many uses can a cardboard box be put to？”

The results？ The wide-awake students did well on the tests.The tired students did poorly.

Research has already shown that tired people can do okay on tests of routine thinking, like simple addition.But Dr.Home tested creative thinking only.

As part of his study, he offered an amount of money as a reward to the sleepy students if they did well.But even this encouragement wasn’t enough to help the students overcome their tiredness.They still did poorly.Dr.Home believes that the cerebral cortex — the part of the brain where thinking takes place — may get worn out during waking hours.Sleep may help to repair the brain overnight.Without any sleep, he emphasizes, “even if you concentrate harder, you cannot do better.”

This study gives people something to think about, especially people like hospital workers and airline pilots, who must stay awake all night and then make emergency decisions.

36.According to the passage, the confusion of your mind is possibly due to _____.

A.the lack of sleep

B.the difficult question

C.the requirement of your creative thinking

D.the requirement of your original thinking

37.Tired people can do everything EXCEPT_____.

A.doing simple addition

B.doing okay on tests of routine thinking

C.answering the creative question well

D.telling other people their names

38.The purpose for Dr.Home to offer a lot of money to the sleepy students is to _____.

A.help them repair their brains

B.stimulate their interests of the question

C.buy some medicine which can make them exciting

D.encourage them to do better

39.Who might be better instructed in their work after reading this passage？

A.Children.

B.Nurses.

C.Students.

D.Businessmen.

40.We can learn from the passage that _____.

A.a foolish man with good sleep may answer creative question well

B.a pilot should fly the aircraft after having good sleep

C.enough sleep is good for your emergency decisions

D.both B and C

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第4题

In most cultures, when you meet acquaintances for the first time during a day, it is norma

l to greet them. The main purpose of this greeting is to 【B1】 a good relationship between the people 【B2】 and each language usually has 【B3】 set phrases which can be used for this purpose. Sometimes, though, there can be 【B4】 differences in the type of phrases which can be used, and cultural misunderstandings can easily 【B5】. The following is a true example.

A young British woman went to Hong Kong to work, and at the time of her 【B6】 she knew nothing about the Chinese culture of language. 【B7】 her way to school one day, she went to the bank to get some money. 【B8】, the bank clerk asked her if she had had her lunch. She was extremely surprised 【B9】 such a question because in the British culture it would be 【B10】 an indirect invitation to lunch. Between unmarried young people it can also 【B11】 the young man's interest in dating the girl. 【B12】 this bank clerk was a complete stranger 【B13】 the British girl, she was very much taken aback (生气), and hastily commented that she had eaten 【B14】. After this she 【B15】 to school and was even more surprised when one of the teachers asked the same question. By now she 【B16】 that it could not be an invitation, but was puzzled 【B17】 why they asked it. 【B18】 the following days she was asked the same question again and again. Only much later 【B19】 that the question had no real meaning 【B20】 --it was merely a greeting.

【B1】

A．build on

B．build up

C．build into

D．build out

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第5题

Section ADirections: In this section, you will hear 8 short conversations and 2 long conve

Section A

Directions: In this section, you will hear 8 short conversations and 2 long conversations. At the end of each conversation, one or more questions will be asked about what was said. Both the conversation and the questions will be spoken only once. After each question there will be a pause. During the pause, you must read the four choices marked A, B, C and D, and decide which is the best answer.

听力原文：W: The undergraduates could hardly understand the French lecture which was given last week．

M: Neither could the graduate students．

Q: What can we learn from the conversation？

(12)

A．The graduate students could understand the lecture.

B．Neither the undergraduate students nor the graduate students could understand the lecture.

C．Both the undergraduate students and the graduate students could understand the lecture.

D．The undergraduate students could understand the lecture.

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第6题

A man who knows a bit about carpentry （木工术) will make his table more quickly than the m

A man who knows a bit about carpentry (木工术) will make his table more quickly than the man who does not. If the instructions are not very clear, or the shape of a piece is puzzling his experience helps him to conclude that it must fit there, or that its function must be that. In the same way, the reader's sense and experience helps him to predict what the writer is likely to ,say next; that he must be going to say this rather than that. A reader who can think along with the writer in this way will find the text.

This skill is so useful that you may wish to make your students aware of it so that they can use it to tackle difficult texts. It does seem to be the case that as we read we make hypotheses (假设) about what the writer intends to say; these are immediately modified by what he actually does say, and are replaced by new hypotheses about what will follow. We have all had the experience of believing we were understanding a text until suddenly brought to a halt by some word or phrase that would not fit into the pattern and forced us to reread and readjust our thoughts. Such occurrences lend support to the notion of reading as a constant making and remaking of hypotheses.

If you are interested in finding out how far this idea accords with (符合) practice, you may like to try out the text and questions. To do so, take a piece of card and use it to mask the text. Move it down the page, revealing only one

t a time. Answer the question before you go on to look at the next section. Check your prediction against what the text actually says, and use the new knowledge to improve your next prediction. You will need to look back to earlier parts of the text if you are to make accurate prediction, for you must keep in mind the general organization of the argument as well as the detail within each sentence. If you have tried this out, you have probably been interested to find how much you can predict, though naturally we should not expect to be right every time -- otherwise there would be no need for us to read.

Conscious use of this technique can be helpful when we are faced with a part of the text that we find difficult: if we can see the overall pattern of the text, and the way the argument is organized, we can make a reasoned guess at the next step. Having an idea of what something might mean can be a great help in interpreting it.

The author uses the examples of carpentry and reading to show______.

A．the importance of making prediction

B．the similarity in using one's senses

C．the necessity of making use of one's knowledge

D．the most effective method in doing anything

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第7题

Liu Hui: Gordon, may I ask you a question?Gordon: Hi, Liu Hui.().Liu Hui: Do I need to p

Liu Hui: Gordon, may I ask you a question？

Gordon: Hi, Liu Hui.().

Liu Hui: Do I need to pay for a TV license if I only watch TV online in the UK？

Gordon: Yes, indeed.You need to be covered by a TV license if you watch or record programs as they're being shown on TV or live on an online TV service.

Liu Hui: Including watching TV on computers and mobile phones？

Gordon:().It is the law.

Liu Hui: I see.How much is the license fee？

Gordon: It costs £145.50 for a color TV license and £49.00 for a black and white TV license.

Liu Hui: That's a lot of money for a year.()？

Gordon: It costs the same for all applicants under 75.When you reach the age of 75, you may apply for a free Over 75 TV License.

Liu Hui: I see.

Gordon: Do you need such a license in China？

Liu Hui:().

Gordon: Oh, it sounds similar.But for BBC, the license fee is the main source of income.There is no advertising on the BBC channels.

Liu Hui: By the way, where should I go to pay for my license？

Gordon:().

Liu Hui: Well, sure! Thank you!

A.Does it cost the same for every household？

B.You can pay right here, on the Internet!

C.Just go ahead.

D.We do for the live Cable TV programs.

E.Exactly, even digital boxes.

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第8题

阅读理解：阅读下面的短文，根据文章内容进行判断，正确写“T”错误写“F”。Do you seem to be late f

阅读理解：阅读下面的短文，根据文章内容进行判断，正确写“T”错误写“F”。

Do you seem to be late for work or school a lot？ Being on time is very important for personal success! Learn to improve your chances for success with these tips for being right on time – all the time!

To be punctual means to do what you should do on time. Being a punctual person, one should:

Recognize time. Keep your watch exact. It may be helpful to set your watch just two minutes ahead. Keep a clock, phone, computer or anything that shows time in each room of your house.

Wake up when you need to. If you have difficulty with this, place your alarm clock to somewhere that you cannot reach from your bedB、that way, you have to get up to turn it off. If you can't get out of bed on time, you may be going to bed too late. Try sleeping earlier to allow yourself at least 7 hours'sleep.

Insist on being 15 minutes early for everything. If you have to be at work at 8:00, tell yourself“I have to be at work at 7:45”. If you do this, you will be on time even with a slight traffic jam. You can talk with others who are early, and that will make you happy before work!

1. Being punctual has nothing to do with personal success. {T、F}

2. It is unnecessary to set your watch two minutes ahead. {T、F}

3. You'd better place your alarm clock beside your bed so that you can turn it off at once. {T、F}

4. Being a punctual person, one should sleep earlier to allow himself more than 7 hours'sleep. {T、F}

5. This passage is mainly about the importance to be punctual. {T、F}

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第9题

Question6: How can I add row numbers to my result set？ In database pubs, have a table titl

Question6: How can I add row numbers to my result set？

In database pubs, have a table titles , now I want the result shown as

below,each row have a row number, how can you do that？

Result:

line-no title_id

----------- --------

1 BU1032

2 BU1111

3 BU2075

4 BU7832

5 MC2222

6 MC3021

7 MC3026

8 PC1035

9 PC8888

10 PC9999

11 PS1372

12 PS2091

13 PS2106

14 PS3333

15 PS7777

16 TC3218

17 TC4203

18 TC7777

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第10题

Today we live in a world where GPS systems, digita...

Today we live in a world where GPS systems, digital maps, and other navigation apps are available on our smart phones. 1 of us just walk straight into the woods without a phone. But phones 2 on batteries, and batteries can die faster than we realize. 3 you get lost without a phone or a compass, and you 4 can’t find north, a few tricks to help you navigate 5 to civilization, one of which is to follow the land... When you find yourself well 6 a trail, but not in a completely 7 area, you have to answer two questions: Which 8 is downhill, in this particular area？ And where is the nearest water source？ Humans overwhelmingly live in valleys, and on supplies of fresh water. 9 , if you head downhill, and follow any H2O you find, you should 10 see signs of people. If you’ve explored the area before, keep an eye out for familiar sights—you may be 11 how quickly identifying a distinctive rock or tree can restore your bearings. Another 12 : Climb high and look for signs of human habitation. 13 , even in dense forest, you should be able to 14 gaps in the tree line due to roads, train tracks, and other paths people carve 15 the woods. Head toward these 16 to find a way out. At night, scan the horizon for 17 light sources, such as fires and streetlights, then walk toward the glow of light pollution. 18 , assuming you’re lost in an area humans tend to frequent, look for the 19 we leave on the landscape. Trail blazes, tire tracks, and other features can 20 you to civilization. 1.

A、Some

B、Most

C、Few

D、All

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