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问题 填空题

设有学生表(姓名,班级名称),用SQL语句检索每个班级的学生总人数的语句是:SELECT班级名称,______AS人数FROM学生表GROUP BY班级名称

答案

参考答案:COUNT(*)

解析: SQL不仅有一般的检索功能,而且还有计算方式的检索,用于计算检索的函数见下表。
计算检索的函数及功能

函数名
选择题

我国在2010年进行了第六次人口普查,人口普查属科学探究常用方法中哪种方法?(  )

A.测量

B.观察

C.实验

D.调查

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补全对话,情景问答

根据对话内容及首字母提示完成所缺的单词。

W: Can you tell me 1. w_____you saw here today?

M: Well, I was walking down the Centre Street when a UFO 2. l_____.

W: Where did it land?

M: 3. R_____here, in front of me.

W: So what happened next?

M: An 4. a_____ got out of the UFO.

W: What were you doing?

M: When the alien got out of the UFO, I was 5. s_____.

W: 6. T_____ what happened?

M: Well, then the alien went into a gift shop and bought a 7. s_____.Then it 8. v_____ the Museum of Flight on Green Street.

W: So 9. w_____ did you do?

M: While it was buying a souvenir, I called the 10. p_____.

1. _____ 2. _____ 3. _____ 4. _____ 5. _____

6. _____ 7. _____ 8. _____ 9. _____ 10. _____

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