高考統計類組的資料處理 - 高考
By Olive
at 2014-07-06T21:10
at 2014-07-06T21:10
Table of Contents
有題問超級鍵
說A,B是唯一的
大家覺得這樣是指
A跟B都是唯一
還是(A,B)是唯一的呢?
我看配分有18分,
所以就當成是前者
即超級鍵有
A,B,AB,AC,BC,ABC
但補習班解答是當成後者,
所以超級鍵只有
AB,ABC
大家怎麼看?
一題18分好多呀><
--
Sent from my Android
--
說A,B是唯一的
大家覺得這樣是指
A跟B都是唯一
還是(A,B)是唯一的呢?
我看配分有18分,
所以就當成是前者
即超級鍵有
A,B,AB,AC,BC,ABC
但補習班解答是當成後者,
所以超級鍵只有
AB,ABC
大家怎麼看?
一題18分好多呀><
--
Sent from my Android
--
Tags:
高考
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By Enid
at 2014-07-11T16:02
at 2014-07-11T16:02
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at 2014-07-14T07:55
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at 2014-07-17T19:56
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at 2014-07-19T21:56
at 2014-07-19T21:56
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at 2014-07-24T00:47
at 2014-07-24T00:47
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at 2014-07-27T19:43
at 2014-07-27T19:43
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