【数据库】作业16——第七章： 数据库设计

原創 Kannoame_Ling00 2020-04-27 13:38

课后习题 7、8、10、11

 

 

作业原地址：作业

 

目录

7.

8.

10.

11.

总结

 

 

7.

 

 

 

8.

 

 

 

 

10.

 

 

 

11.

 

  因为各个关系模式都只有一个码，且都是唯一确定的，所以都属于BCNF，不会产生更新异常。

 

 

总结

 

  不是很难，挺简单的。E-R图用word做了一遍发现太大了，截下图来看的不清楚，就用ProcessON做了一遍。

 

完成时间：22min

          以上

                                         ————（2020.4.26）

 

 

 

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