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问题 单项选择题

SQL用于显示部分查询结构的TOP短语，必须与( )短语同时使用才有效。

A．HAVING
B．DISTINCT
C．ORDER BY
D．GROUP BY

答案

参考答案：C

解析： TOP短语必须与ORDER BY短语一起使用才有效。TOP短语用来显示查询结果的部分记录，不能单独使用，必须与排序短语ORDER BY一起使用才有效。

多项选择题

期货期权按内涵价值来分，可以分为（）。

A.实值期权

B.虚值期权

C.看涨期权

D.平值期权
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填空题

Beijing: The United States and North Korea had their first (1) in four months here this afternoon as part of the (2) negotiations on how to end North Korea’s nuclear program, but diplomats played clown prospects for (3) . The talks are at the Diaoyutai (4) , a sprawling, garden-filled (5) in western Beijing, with negotiators gathering around a giant hexagonal table built to (6) the six delegations. The Chinese placed the Americans and the North Koreans in (7) , which may have facilitated the (8) between Mr. Kelly and Mr. Kim, which took place (9) in the afternoon session. The two spoke for 30 minutes, two Asian diplomats (10) . The early indications of how the talks are going (11) . A South Korean who took part in the meetings described North Korea as "willing to (12) through dialogue." Chinese officials also put a (13) on the talks. "I heard talks this morning and this afternoon were very successful," the Foreign Minister, Li Zhaoxing, told delegates (14) . But Japanese and Russian participants were (15) . The Russian (16) , Aleksandr Losyukov, described the negotiations as (17) . "So far, the countries have put forward a number of (18) , which are (19) the development of these talks," he told Russian reporters in Beijing. "I would not say that I am feeling (20) ."
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