【數據庫】作業16——第七章： 數據庫設計

原創 Kannoame_Ling00 2020-04-27 13:38

課後習題 7、8、10、11

 

 

作業原地址：作業

 

目錄

7.

8.

10.

11.

總結

 

 

7.

 

 

 

8.

 

 

 

 

10.

 

 

 

11.

 

  因爲各個關係模式都只有一個碼，且都是唯一確定的，所以都屬於BCNF，不會產生更新異常。

 

 

總結

 

  不是很難，挺簡單的。E-R圖用word做了一遍發現太大了，截下圖來看的不清楚，就用ProcessON做了一遍。

 

完成時間：22min

          以上

                                         ————（2020.4.26）

 

 

 

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