Which of the following can be used to ensure that once a row has been inserted in table TABLEX, the column MAINID in that row cannot be updated?（）A、Define the column MAINID as NOT UPDATABLEB、Define the column MAINID as a PRIMARY KEYC、Define the column MAI

题目

Which of the following can be used to ensure that once a row has been inserted in table TABLEX, the column MAINID in that row cannot be updated?（）

A、Define the column MAINID as NOT UPDATABLE
B、Define the column MAINID as a PRIMARY KEY
C、Define the column MAINID as a FOREIGN KEY
D、Define an UPDATE trigger on table TABLEX

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相似问题和答案

第1题：

Which of the following methods can move files in clear text and can be easily intercepted?()

A.RSH

B.SNMP

C.FTP

D.TELNET

参考答案：C

第2题：

Which of the following is not talked in the passage as which can help us communicate?

A.books and magazines B.TV and films C.newspapers D.radio

正确答案：C

第3题：

A dog or a cat can teach us a lot about human nature. They are a lot more like us ______some might think.

A. that

B. what

C. than

D. which

正确答案：C
[解析] 考查固定搭配more…than…

第4题：

Which of the following technologies can improve convergence time following a link failure in a serviceprovider network？（）

A、MPLS TE FR
B、MPLS VPN
C、BFD
D、RSVP
E、VPLS
F、SNMP

正确答案:C

第5题：

Which of the following shows the proper rhythmical pattern of the sentence?

A．′Come to ′see us at our ′new a′partment.
B．′Come to ′see us at′our new ′apartment.
C．′Come to ′see us ′at our ′new ′apartment.
D．′Come to ′see us ′at our ′new a′partment.

答案：A

解析：

考查句子重读。一般来说，句子中的实词需要重读，比如名词、动词、形容词、副词、数词等。虚词多数情况下不重读，比如冠词、介词、物主代词(形容词性)、连词、感叹词等。故A项正确。

第6题：

（）According to the passage, which of the following is NOT true?

A．People who live in cold climates had better paint the walls of their houses white.

B．Many women like to be in white on their wedding day because it’s the color of purity.

C．Sometimes colors can affect our feelings and moods.

D．Wearing green can give us more energy when we are feeling tired.

正确答案：A

第7题：

Which of the following statement is NOT true?

A. When you run out of money, you can ask your partner to call back.

B. Telephone books in the US have different colors.

C. The state of Oregon has several area codes.

D. An area code is necessary in making a long-distance call.

正确答案：C

40．答案为C 从全文可知A、B、D选项是正确的陈述，从第一段可知一个地区只有一个区号，不论该地区是大是小。

第8题：

Which of the following infinitives is used as the object complement()?

A.Do you know what to say to a person on his birthday

B.It takes us about 45 minutes to go to the station

C.we can see buses come and go in a busy street

D.It is too late to catch the 9:30 train

答案：C

解析：感官动词see, watch, observe, look at, hear, listen to, notice 等和使役动词have 后面的宾补有三种形式，即原形动词（不带to 的不定式）、现在分词和过去分词。现在分词表主动或正在进行，过去分词表被动或完成，动词原形表主动和完成；由选项中可知，C选项中see sth do ；后面接原形动词（不带to 的不定式）做宾补，故选C

第9题：

Which of the following is not mentioned in this article?__________

A.The number of the Chinese students studying in the US
B.The Chinese government's reaction to this affair
C.The time when the US delegation will leave Beijing
D.The increase of the US students that study in China

答案：C

解析：

文章第六段“Morethan63，000Chinese students are currently studyingintheUnitedStates”可以排除A项；文章第二段可以得知政府对这次事件的反应是号召的，故排除B；文章倒数第三段“…shows that6．389 us students eame to China in the 2005—2006 academic year，up 35 percent year-on—year．”可以知道在中国
学习的美国学生增加了．排除D。故答案选C。

第10题：

Please send us as soon as possible samples of the following goods _____ listed in your current catalogue.

A、which
B、as
C、what
D、for which

正确答案:B

Which of the following can be us

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