資料庫ER model的基數表示 - 考試
By Oliver
at 2014-05-04T15:25
at 2014-05-04T15:25
Table of Contents
最近看某函授的時候注意到
他的基數表示法和我之前看的書的表示法剛好相反
例:每一位教授至少要指導一位學生 也可以多位
每一位研究生只能被一位教授指導
(1,1) (1,N)
A) 教授-----指導-----研究生
(1,N) (1,1)
B) 教授-----指導-----研究生
請問A和B哪個才正確?
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