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如何处理此模型的可选字段？

[英]How to handle optional fields for this model?

原文 2016-02-05 00:44:23 2 1 mysql/ database-design

I am working on a small database that has information for staff, teachers and students. 我正在使用一个小型数据库，该数据库具有适用于员工，老师和学生的信息。 Because I am only storing information like name , lastname , gender , id and their role on the sistem I decided to use a Person table with this fields. 因为我仅在系统上存储诸如name ， lastname ， gender ， id及其role等信息，所以我决定在此字段中使用Person表。

But here is where I am having trouble, the student can have information like allergies , blood type etc. Such information is only applied to the Student role so I am clearly reluctant in making those columns in Person 但是在这里我遇到了麻烦，学生可以得到诸如allergies ， blood type等信息。此类信息仅适用于Student角色，因此我显然不愿意在“ Person中创建这些列

I am also not sure if having a table Medical_Record would be an appropiate solution. 我也不确定是否有一个表Medical_Record是否合适。 I was hoping someone could give me some pointers to solve this problem. 我希望有人可以给我一些指导来解决这个问题。

Here is my preliminary design: 这是我的初步设计：

1 个解决方案

Making another table is suitable for this situation, although you may want to include the users(student) id as a column within the MedicalRecord table. 尽管您可能希望将users（student）id作为一列包含在MedicalRecord表中，但制作另一个表也适用于这种情况。 Then creating a relation between the users id in MedicalRecord to Person , this then helps with the time to process a query to fetch a row of the data inside MedicalRecord with the users id. 然后在MedicalRecord的用户ID与Person之间创建一个关系，这有助于MedicalRecord时间来处理查询以获取具有用户ID的MedicalRecord的一行数据。