问题 单项选择题

下列有关索引的叙述中不正确的是

A.一个基本表中可以建立一个或多个索引

B.一个基本表中可以建立一个或多个聚簇索引

C.一个基本袁中可以建立一个或多个非聚簇索引

D.建立聚簇索引后,更新数列时会导致数据物理顺序变更

答案

参考答案:B

解析: 在基本表上建立一个或多个索引,以提供多种存取路径,加快查找速度。用户可以在最频繁查询的列上建立聚簇索引以提高查询效率,显然在一个基本表上最多只能建立一个聚簇索引。建立聚簇索引后,更新数列时会导致数据物理顺序变更,代价较大。

阅读理解

阅读理解。

     The Chinese mainland (大陆) and Taiwan have become closer now after Taiwanese leaders' visits and talks

across the straits (海峡). On May 3, 2005 Kuomintang Chairman Lian Chan finished his eight-day visit to the

mainland. Only two days later another Taiwanese leader James Soong-Song Chuyu visited again.

     Soong is Chairman of the People First Party (亲民党) in Taiwan. On his nine-day trip from May 5-13, he

visited Xi'an, Nanjing, Shanghai and Changsha as well as Beijing. Soong, 63, was born in Xiangtan, Hunan

Province in 1942. He went to Taiwan with his father at the age of seven.

     On May 9, Soong went back to Xiangtan to sweep his ancestor's tombs (祖坟). He also met President Hu

Jintao. When he arrived in Beijing on May 11.

     Soong hopes his trip can build a bridge of trust (信任), understanding and cooperation (合作) between

Taiwan and the Mainland.

     The two Parties in Taiwan both agree with the "ONE CHINA" policy and in favor of the final unification

(统一) of China.

     Things continue to get better since their visit. Taiwan can now sell more fruits in the Mainland. The mainland

plans to give a pair of giant pandas to Taiwan.

     More importantly mainland people will soon be able to travel to the beautiful island.

1. Lian Chan spent _______ visiting the mainland. [ ]

A. seven days

B. eight days

C. eighteen days

D. nine days

2. James Soong went to Taiwan with his father in ________. [ ]

A. 1947

B. 1948

C. 1949

D. 1950

3. We can tell from the story that ________. [ ]

A. both James Soong and Lian Chan's visit will help the mainland and Taiwan know more about each other.

B. Lian Chan wants to live in the mainland

C. James Soong was too busy to go back to his hometown

D. there are two Parties in Taiwan now.

4. What does the underlined phrase "in favor of" mean? ________. [ ]

A. 支持

B. 反对

C. 喜爱

D. 保护

5. According to the picture. Which sentence is right? ________.

        [ ]

A. James Soong was visiting Shanghai and giving a speech.

B. President Hu Jintao was meeting James Soong.

C. James Soong was making a speech in Beijing.

D. James Soong was talking to Changsha's students.

选择题