問題詳情

三、假設有下面一個實體關係圖(Entity-Relationship Diagram),圖中鄰近各實體的數字代表該實體參與的關係之「至少」、「至多」的對應比率次數限制(*代表沒有限制)。請將其轉為關聯式資料庫的 Schema。請注意將主鍵以底線標示。若某物件有數種可能的關聯式資料庫 Schema 轉換方式,請分別列出,並說明各方式的優缺點,以及標註清楚你最後的建議方式。(20 分) 

參考答案

答案:C
難度:適中0.412844
統計:A(72),B(30),C(90),D(15),E(0)

用户評論

小教上岸了!謝謝阿。需要】評論

The saying “Dogs are people’s best friends” is an old one. People and dogs _____6_____ together since ancient times. Many dogs serve _____7_____ as pets. But some dogs have real jobs to do. They work as police dogs and as guide dogs for the blind. Some breeds of dogs do these jobs _____8_____ others. Very often, people choose German shepherds for this work. What makes these dogs so good at it? German shepherds have many _____9_____ that make them good work dogs. For one thing, they are the right size. They are quite large and strong. They also look alert and are very smart. So it is easy to...

金榜題名】評論

they are the right size. They are quite large and strong. They also look alert and are very smart. So it is easy to train them to do hard jobs. 

Jay Chen】評論

Its better ans & clues on 3rd floor