问题 单项选择题

数据更新包括插入数据、( )和删除数据3条语句。

A.修改数据

B.记录数据

C.编制数据

D.查询数据

答案

参考答案:A

解析: 数据更新包括插入数据、修改数据和删除数据3条语句。 相关知识点: ①插入数据 SQL的数据插入语句INSERT通常有两种形式,一种是插入一个元组,另一种是插入一个子查询结果,后者可以一次插入多个元组。 ②修改数据 修改数据语句的一般格式为: UPDATE <表名> SET <列名><表达式>[<列名>=<表达式>]... [WHERE<条件>]; 其功能是修改指定表中满足WHERE子句条件的元组。其中,SET子句给出<表达式>的值用于取代相应的属性列表。如果省略WHERE子句,则表示要修改表中的所有元组。 ③删除数据 删除数据一般的格式为: DELETE FROM<表名> [WHERE<条件>]; DELETE语句的功能是从指定表中删除满足 WHERE子句条件的所有元组。如果省略WHERE子句,表示删除表中所有元组,但表的定义仍在字典中。也就是说,DELETE语句删除的是表中的数据,而不是关于表的定义。

选择题
阅读理解

阅读理解

      Cultural differences in business entertaining include problems such as whom one entertains and where

and how one entertains. In countries where status is important, it is not advisable to invite people of

different statuses to the same dinner party. Americans will often invite people to their homes. However,

in some societies the home is considered too personal, unworthy, or too small to serve as a proper place

for business entertaining. In some countries there is a "help yourself" method of entertaining done in the

home. This method does not work well when entertaining people whose culture teaches them to wait to

be asked three times before accepting an offer of food. For example, a Chinese guest went hungry all the

evening without eating though he was quite hungry because he was too shy to take food after only being

asked to do so once. In another case, an American woman executive(负责人) was being entertained in

London. After having the tea served, the American woman helped herself to cream and sugar rather than

waiting to be served. The English hostess was upset by the thought that she was not serving quickly

enough.

     As a general rule, a small gift from your home country is OK. A gift that is tied to the particular

interest of the person is especially good. Gifts for children are also well received. Be careful that the

"hometown" gift you are bringing to Singapore is not made in Hong Kong. Because many gifts carry

symbolic meanings, it is always best to seek the advice of a cultural information before selecting gifts.

The giving of large gifts, or payments for special service, should only be carried out after talking with

legal department in the home and host culture.

1. It is no good inviting people of different social positions to the same party in the country where ____.

A. people don't pay any attention to your positions

B. people care much about their statuses

C. entertainment is important

D. entertainment is not advisable

2. The Chinese guest is taken for an example to show ________.

A. that offering food should not be made too early

B. a "help yourself" method works well in this case

C. that accepting an offer of food should be made later

D. a "help yourself" method does not work well in some cases

3. The passage infers that American women like _________.

A. a "help yourself" method  

B. waiting to be served  

C. a slow service    

D. cream and sugar

4. _________ is especially proper, when you are invited to a dinner party.

A. A big gift

B. Large payment as a gift

C. A small gift from one's home

D. A gift form Singapore