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【单选题】
对于图书管理数据库,求人民邮电出版社出版图书的最高单价、最低单价和平均单价。下面SQL语句横线部分,命令正确的是 SELECT FROM 图书 WHERE 出版单位='人民邮电出版社' 设有图书管理数据库中包含以下表: 图书(总编号C(6),分类号C(8),书名C(16),作者C(6),出版单位C(20),单价N(6,2))
A.
MAX(单价),MIN(单价),AVG(单价)
B.
MAX(单价),MIN(单价),AVERAGE(单价)
C.
MAX(单价),MIX(单价),SUM(单价)
D.
MAX(单价),SUM(单价),AVG(单价)
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B.
I must confess that I always … those “as soon as my head touches the pillow” fellows.
C.
I used to read, … thanks to their “iron wills,” could lie down and plunge themselves immediately into deep sleep, …
D.
I had overlooked the necessity of having an “iron will,” … this peculiar metallic quality.
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相关题目：
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A.
拉伸弹簧
B.
压缩弹簧
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A.
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B.
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A.
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B.
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A.
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B.
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查看完整题目与答案
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A.
wouldn't
B.
needn't
C.
mustn't
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A.
Surely, humor is the saving grace of us, for without it we should die of vexation.
B.
I must confess that I always … those “as soon as my head touches the pillow” fellows.
C.
I used to read, … thanks to their “iron wills,” could lie down and plunge themselves immediately into deep sleep, …
D.
I had overlooked the necessity of having an “iron will,” … this peculiar metallic quality.
查看完整题目与答案