問題詳情
一、下列是一個大學的資料模型的片段,有四個實體:學生、大學生、研究生、老師。 ⑴學校只有兩種學生:大學生、研究生,這兩種身分是不重疊的,亦即是研究生就不會是大學生;反之,亦同。 ⑵每位學生都要選擇一位老師為輔導老師,而且只能一位;但一位老師可以輔導多位學生,但也可以沒有。 ⑶老師的主管也是老師,也就是系主任,系主任由老師中選任一位擔任,他(她)通常管理有多位老師。以上述四個實體為限,畫出實體關聯圖(Entity-Relationship diagram)。(20 分)
參考答案
答案:B
難度:適中0.645833
統計:A(12),B(93),C(20),D(9),E(0)
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