103高考資料庫 - 高考
By Zanna
at 2014-08-04T20:20
at 2014-08-04T20:20
Table of Contents
http://ppt.cc/Wrny
想請問
ACCEPT內的SuperKey分別有哪些,感覺對於要抓出Superkey還不是很靈敏~"~,
不知道有什麼特性可以快速判斷呢?
題目說明相關_ID都能當key值,那可以說
E_ID、O_ID各別當一組Superkey嗎? 還是說一定需一起當子集合才算是Superkey?
想請問這個Accept內是有幾個Superkey呢?
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